<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0300-9041</journal-id>
<journal-title><![CDATA[Ginecología y obstetricia de México]]></journal-title>
<abbrev-journal-title><![CDATA[Ginecol. obstet. Méx.]]></abbrev-journal-title>
<issn>0300-9041</issn>
<publisher>
<publisher-name><![CDATA[Federación Mexicana de Colegios de Obstetricia y Ginecología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0300-90412019001100006</article-id>
<article-id pub-id-type="doi">10.24245/gom.v87i11.3089</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Elevación de las concentraciones de progesterona el día de la captura de ovocitos y su influencia en el ciclo de fecundación in vitro]]></article-title>
<article-title xml:lang="en"><![CDATA[Elevated progesterone level at oocyte retrieval and IVF outcome]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Roque-Fernández]]></surname>
<given-names><![CDATA[María Ángeles]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Mirasol]]></surname>
<given-names><![CDATA[Esteban]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez-Lleó]]></surname>
<given-names><![CDATA[Cristina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Toledo]]></surname>
<given-names><![CDATA[María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Garrido]]></surname>
<given-names><![CDATA[Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Amezcua-Recover]]></surname>
<given-names><![CDATA[Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Complejo Hospitalario Universitario de Albacete Unidad de Reproducción ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>España</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Castilla-La Mancha Facultad de Medicina de Albacete Departamento de Ciencias Médicas]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Hospital Clínico Universitario de Valencia  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="Af4">
<institution><![CDATA[,Complejo Hospitalario Universitario de Albacete  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad de Castilla-La Mancha Facultad de Medicina de Albacete Departamento de Ciencias Médicas]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Spain</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>87</volume>
<numero>11</numero>
<fpage>740</fpage>
<lpage>746</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0300-90412019001100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0300-90412019001100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0300-90412019001100006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  OBJETIVO:  Evaluar si las concentraciones elevadas de progesterona el día de la captura de ovocitos influyen en el resultado del ciclo de fertilización in vitro.  MATERIALES Y MÉTODOS:  Estudio de cohortes, prospectivo, de ciclos de FIV-ICSI, con protocolo agonista largo o antagonista y con transferencia de embriones en fresco en día 2-3. Se consideraron concentraciones elevadas de progesterona a las superiores al percentil 90. Variables analizadas: tasas de embarazo bioquímico (&#946;-hCG positiva), clínico (embrión intrauterino vivo en semanas 6-7) y de abortos del primer trimestre.  RESULTADOS:  Se estudiaron 400 ciclos de FIV-ICSI, con protocolo agonista largo (n = 41) o antagonista (n = 359) y con transferencia de embriones en fresco en día 2-3. No se encontraron diferencias estadísticamente significativas en las tasas de embarazo cuando la progesterona excedió de 14 ng/mL (percentil 90), con porcentajes parecidos de embarazo bioquímico en ambos grupos (41 vs 40.2%). Si bien el porcentaje de embarazo clínico fue ligeramente menor en el grupo con elevación de la progesterona (30.8 vs 33.5%), también se observó mayor porcentaje de abortos (25.7 vs 43.8%) aunque estos resultados tampoco fueron significativos.  CONCLUSIONES:  La elevación de la progesterona el día de la captura de ovocitos no empeora el resultado del ciclo de fertilización in vitro en cuanto a tasas de embarazo, aunque se observa una tendencia a la disminución en la tasa de embarazo clínico y mayor cantidad de abortos en el grupo con elevación de la progesterona.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  OBJECTIVE:  To investigate the relationship between serum progesterone level on the day of oocyte retrieval and pregnancy outcomes in patients undergoing IVF.  MATERIALS AND METHODS:  Prospective cohort study of IVF-ICSI cycles, with long or antagonistic agonist protocol and with fresh embryo transfer on day 2-3. We proposed a serum progesterone level on p90 on day of oocyte retrieval. The main outcome analysed are biochemichal and clinical pregnancy and first trimester miscarriage.  RESULTS:  400 cycles of IVF-ICSI were studied, with long agonist protocol (n = 41) or antagonist (n = 359) and with fresh embryo transfer on day 2-3. Pregnancy rate was similar in both groups (41 vs 40.2%) and clinical pregnancy rate was lower (30.8 vs 33.5%), but it wasn&#8217;t statically significance. There was more miscarriage in elevation progesterone group (25.7 vs 43.8%), but it wasn´t statiscally significance.  CONCLUSION:  Progesterone elevation on oocyte retrieval are not associated with the IVF outcome, but there is a trend to lower clinical pregnancy and more miscarriages.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Progesterona]]></kwd>
<kwd lng="es"><![CDATA[recuperación de ovocitos]]></kwd>
<kwd lng="es"><![CDATA[desenlace del embarazo]]></kwd>
<kwd lng="es"><![CDATA[tasa de embarazo]]></kwd>
<kwd lng="en"><![CDATA[Progesterone]]></kwd>
<kwd lng="en"><![CDATA[Oocyte retrieval]]></kwd>
<kwd lng="en"><![CDATA[Pregnancy outcome]]></kwd>
<kwd lng="en"><![CDATA[Pregnancy rate]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lawrenz]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Premature progesterone rise in ART-cycles]]></article-title>
<source><![CDATA[Reprod Biol]]></source>
<year>2018</year>
<volume>18</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>1-4</page-range></nlm-citation>
</ref>
<ref id="B2">
<label>2</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Edelstein]]></surname>
<given-names><![CDATA[MC]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Progesterone levels on the day of human chorionic gonadotropin administration in cycles with gonadotropin-releasing hormone agonist suppression are not predictive of pregnancy outcome]]></article-title>
<source><![CDATA[Fertil Steril]]></source>
<year>1990</year>
<volume>54</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>853-7</page-range></nlm-citation>
</ref>
<ref id="B3">
<label>3</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bosch]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Premature luteinization during gonadotropin-releasing hormone antagonist cycles and its relationship with in vitro fertilization outcome]]></article-title>
<source><![CDATA[Fertil Steril]]></source>
<year>2003</year>
<volume>80</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>1444-9</page-range></nlm-citation>
</ref>
<ref id="B4">
<label>4</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Barros-Delgadillo]]></surname>
<given-names><![CDATA[JC]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Repercusión de la elevación prematura de progesterona el día de la aplicación de hCG según la respuesta ovárica a la estimulación en ciclos de FIV-ICSI]]></article-title>
<source><![CDATA[Ginecol Obstet Mex]]></source>
<year>2016</year>
<volume>84</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>331-4</page-range></nlm-citation>
</ref>
<ref id="B5">
<label>5</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Venetis]]></surname>
<given-names><![CDATA[CA]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Estimating the net effect of progesterone elevation on the day of hCG on live birth rates after IVF a cohort analysis of 3296 IVF cycles]]></article-title>
<source><![CDATA[Hum Reprod Oxf Engl]]></source>
<year>2015</year>
<volume>30</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>684-91</page-range></nlm-citation>
</ref>
<ref id="B6">
<label>6</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Venetis]]></surname>
<given-names><![CDATA[CA]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Basal serum progesterone and history of elevated progesterone on the day of hCG administration are significant predictors of late follicular progesterone elevation in GnRH antagonist IVF cycles]]></article-title>
<source><![CDATA[Hum Reprod Oxf Engl]]></source>
<year>2016</year>
<volume>31</volume>
<numero>8</numero>
<issue>8</issue>
<page-range>1859-65</page-range></nlm-citation>
</ref>
<ref id="B7">
<label>7</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ubaldi]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Premature luteinization in in vitro fertilization cycles using gonadotropin-releasing hormone agonist (GnRH-a) and recombinant follicle-stimulating hormone (FSH) and GnRH-a and urinary FSH]]></article-title>
<source><![CDATA[Fertil Steril]]></source>
<year>1996</year>
<volume>66</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>275-80</page-range></nlm-citation>
</ref>
<ref id="B8">
<label>8</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Serum progesterone concentrations on the day of HCG administration cannot predict pregnancy in assisted reproduction cycles]]></article-title>
<source><![CDATA[Reprod Biomed Online]]></source>
<year>2004</year>
<volume>8</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>183-90</page-range></nlm-citation>
</ref>
<ref id="B9">
<label>9</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Andersen]]></surname>
<given-names><![CDATA[AN]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Clinical outcome following stimulation with highly purified hMG or recombinant FSH in patients undergoing IVF a randomized assessor-blind controlled trial]]></article-title>
<source><![CDATA[Hum Reprod Oxf Engl]]></source>
<year>2006</year>
<volume>21</volume>
<numero>12</numero>
<issue>12</issue>
<page-range>3217-27</page-range></nlm-citation>
</ref>
<ref id="B10">
<label>10</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Xu]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Serum progesterone level effects on the outcome of in vitro fertilization in patients with different ovarian response an analysis of more than 10,000 cycles]]></article-title>
<source><![CDATA[Fertil Steril]]></source>
<year>2012</year>
<volume>97</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>1321-7</page-range></nlm-citation>
</ref>
<ref id="B11">
<label>11</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Abuzeid]]></surname>
<given-names><![CDATA[MI]]></given-names>
</name>
<name>
<surname><![CDATA[Sasy]]></surname>
<given-names><![CDATA[MA]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Elevated progesterone levels in the late follicular phase do not predict success of in vitro fertilization-embryo transfer]]></article-title>
<source><![CDATA[Fertil Steril]]></source>
<year>1996</year>
<volume>65</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>981-5</page-range></nlm-citation>
</ref>
<ref id="B12">
<label>12</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ochsenkühn]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Subtle progesterone rise on the day of human chorionic gonadotropin administration is associated with lower live birth rates in women undergoing assisted reproductive technology a retrospective study with 2,555 fresh embryo transfers]]></article-title>
<source><![CDATA[Fertil Steril]]></source>
<year>2012</year>
<volume>98</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>347-54</page-range></nlm-citation>
</ref>
<ref id="B13">
<label>13</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bosch]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Circulating progesterone levels and ongoing pregnancy rates in controlled ovarian stimulation cycles for in vitro fertilization analysis of over 4000 cycles]]></article-title>
<source><![CDATA[Hum Reprod Oxf Engl]]></source>
<year>2010</year>
<volume>25</volume>
<numero>8</numero>
<issue>8</issue>
<page-range>2092-100</page-range></nlm-citation>
</ref>
<ref id="B14">
<label>14</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Silverberg]]></surname>
<given-names><![CDATA[KM]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Serum progesterone levels predict success of in vitro fertilization/embryo transfer in patients stimulated with leuprolide acetate and human menopausal gonadotropins]]></article-title>
<source><![CDATA[J Clin Endocrinol Metab]]></source>
<year>1991</year>
<volume>73</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>797-803</page-range></nlm-citation>
</ref>
<ref id="B15">
<label>15</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bu]]></surname>
<given-names><![CDATA[Z]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Serum progesterone elevation adversely affects cumulative live birth rate in different ovarian responders during in vitro fertilization and embryo transfer a large retrospective study]]></article-title>
<source><![CDATA[PloS One]]></source>
<year>2014</year>
<volume>9</volume>
<numero>6</numero>
<issue>6</issue>
</nlm-citation>
</ref>
<ref id="B16">
<label>16</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Nayak]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Progesterone level at oocyte retrieval predicts in vitro fertilization success in a short-antagonist protocol a prospective cohort study]]></article-title>
<source><![CDATA[Fertil Steril]]></source>
<year>2014</year>
<volume>101</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>676-82</page-range></nlm-citation>
</ref>
<ref id="B17">
<label>17</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Huang]]></surname>
<given-names><![CDATA[Y]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Progesterone elevation on the day of human chorionic gonadotropin administration adversely affects the outcome of IVF with transferred embryos at different developmental stages]]></article-title>
<source><![CDATA[Reprod Biol Endocrinol RBE]]></source>
<year>2015</year>
<volume>13</volume>
<page-range>82</page-range></nlm-citation>
</ref>
<ref id="B18">
<label>18</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Julien]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Premature progesterone rise on day of hCG negatively correlated with live birth rate in IVF cycles: an analysis of 1,022 cycles]]></article-title>
<source><![CDATA[J Gynecol Obstet Hum Reprod]]></source>
<year>2018</year>
</nlm-citation>
</ref>
<ref id="B19">
<label>19</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bustillo]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Serum progesterone at the time of human chorionic gonadotrophin does not predict pregnancy in in-vitro fertilization and embryo transfer]]></article-title>
<source><![CDATA[Hum Reprod Oxf Engl]]></source>
<year>1995</year>
<volume>10</volume>
<numero>11</numero>
<issue>11</issue>
<page-range>2862-7</page-range></nlm-citation>
</ref>
<ref id="B20">
<label>20</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Urman]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Elevated serum progesterone level on the day of human chorionic gonadotropin administration does not adversely affect implantation rates after intracytoplasmic sperm injection and embryo transfer]]></article-title>
<source><![CDATA[Fertil Steril]]></source>
<year>1999</year>
<volume>72</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>97599</page-range></nlm-citation>
</ref>
<ref id="B21">
<label>21</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Niu]]></surname>
<given-names><![CDATA[Z]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Progesterone levels on oocyte retrieval day can predict the quantity of viable embryos but not pregnancy outcome of intracytoplasmic sperm injection]]></article-title>
<source><![CDATA[Gynecol Endocrinol Off J Int Soc Gynecol Endocrinol]]></source>
<year>2008</year>
<volume>24</volume>
<numero>8</numero>
<issue>8</issue>
<page-range>452-8</page-range></nlm-citation>
</ref>
<ref id="B22">
<label>22</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Andersen]]></surname>
<given-names><![CDATA[YC]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Preovulatory progesterone concentration associates significantly to follicle number and LH concentration but not to pregnancy rate]]></article-title>
<source><![CDATA[Reprod Biomed Online]]></source>
<year>2011</year>
<volume>23</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>187-95</page-range></nlm-citation>
</ref>
<ref id="B23">
<label>23</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Martinez]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Should progesterone on the human chorionic gonadotropin day still be measured]]></article-title>
<source><![CDATA[Fertil Steril]]></source>
<year>2016</year>
<volume>105</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>86-92</page-range></nlm-citation>
</ref>
<ref id="B24">
<label>24</label><nlm-citation citation-type="book">
<source><![CDATA[Criterios ASEBIR de Valoración morfológica de oocitos, embriones tempranos y blastocistos humanos]]></source>
<year>2015</year>
<publisher-name><![CDATA[Asebir]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B25">
<label>25</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Requena]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[High progesterone levels in women with high ovarian response do not affect clinical outcomes a retrospective cohort study]]></article-title>
<source><![CDATA[Reprod Biol Endocrinol RBE]]></source>
<year>2014</year>
<volume>12</volume>
<page-range>69</page-range></nlm-citation>
</ref>
<ref id="B26">
<label>26</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Venetis]]></surname>
<given-names><![CDATA[CA]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Is progesterone elevation on the day of human chorionic gonadotrophin administration associated with the probability of pregnancy in in vitro fertilization A systematic review and meta-analysis]]></article-title>
<source><![CDATA[Hum Reprod Update]]></source>
<year>2007</year>
<volume>13</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>343-55</page-range></nlm-citation>
</ref>
<ref id="B27">
<label>27</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Venetis]]></surname>
<given-names><![CDATA[CA]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Progesterone elevation and probability of pregnancy after IVF a systematic review and meta-analysis of over 60 000 cycles]]></article-title>
<source><![CDATA[Hum Reprod Update]]></source>
<year>2013</year>
<volume>19</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>433-57</page-range></nlm-citation>
</ref>
<ref id="B28">
<label>28</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kolibianakis]]></surname>
<given-names><![CDATA[EM]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Significantly lower pregnancy rates in the presence of progesterone elevation in patients treated with GnRH antagonists and gonadotrophins a systematic review and meta-analysis]]></article-title>
<source><![CDATA[Curr Pharm Biotechnol]]></source>
<year>2012</year>
<volume>13</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>464-70</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
