0034-7450 0034-7450 S0034-74502020000400227 10.1016/j.rcp.2020.07.002 Colombia Colombia 00 12 2020 00 12 2020 49 4 227 228 1 2020 368 m1198 2 2020 7 228-9 3 2020 4 2020 17 1-3 5 2015 24 203-17 6 2020 83 3-4