0036-3634 0036-3634 S0036-36342018000200003 10.21149/8400 USA Mexico USA Mexico 00 04 2018 00 04 2018 60 2 115 116 1 2016 65 13 13 355-6 2 2017 944 19-25 3 1980 27 4 4 343-4 4 Center for Science Information 5 2002 47-130 6 Gobierno Federal, Secretaría de Salud, Sedena, Semar 2014