1726-8958 1726-8958 S1726-89582021000200007 Bolivia 00 00 2021 00 00 2021 27 2 7 8 1 World Health Organization 2021 2 2021 10 2 2 85-90 3 2021 10 2 2 99-100 4 2021 10 2 2 60-8 5 2021 10 2 2 78-84 6 WHO 7 2021 84 1 1 1-2