1561-2953 1561-2953 S1561-29532020000100011 Colombia 00 04 2020 00 04 2020 31 1 1 WHO 2 2020 382 760-2 3 2020 323 1335 4 2020 382 645-8 5 2020 395 1054-62 6 2020 1-12 7 2007 38 95-102 8 2005 63 197-202 9 2005 63 363-5