1405-0927 1405-0927 S1405-09272020000200009 10.48102/hyg.vi55.345 Mexico 00 12 2020 00 12 2020 55 9 16 1975 60 198 198 83 1999 93-8 1979 17-28 2004 340 1998 37 2 2 153-7 1995 4 4 317 2014 96