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2008 78 ^s2 ^s2 2 82-93 American Academy of Pediatrics 2004 114 555-76 2010 73 511-28 2012 44 e16-7 2011 21 245-52 2010 12 612-22 2011 20 557-62 2013 6 165-75 2015 53 240-9 Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán 2004 Department of Health and Human Services 2013 2002 59 517-24 2004 12 ^s3 ^s3 3 S80-7 2009 51 14-8 2000 42 529-32 2014 34 43-9 2011 613 2009 48 543-8 2016 37 297-301 2010 29 281-8 2016 87 180-5 2013 62 742-51 2007 54 265-71