2528-7907 2528-7907 S2528-79072020000400187 10.36097/rsan.v1i43.1407 Ecuador Ecuador Ecuador 00 12 2020 00 12 2020 43 187 196

2015 24 1 1 27-35 2018 44 2 2 2019 16 4 4 339-50 2020 2016 2017 2012 ) 9 1 1 45-53 2010 6a Ed 2012 2013 16 2 2 20-5 1993 42 148-52 2019 90 4 4 399-410 Organización Mundial de la Salud (OMS) 2017 2017 88 03 03 332-9 2017 47 270-80 2015 2012 2017 29 3 3