1405-9940 1405-9940 S1405-99402021000600034 10.24875/acm.21000164 Mexico 00 12 2021 00 12 2021 91 34 39

1 World Health Organization 2020 2 2020 2 82-9 3 2020 2020 ehaa743 4 2020 90 58-63 5 2020 155 179-80 6 2020 72 280-2 7 2020 13 8 2021 74 474-6 9 2020 58 269-72