0120-5307 0120-5307 S0120-53072020000200002 10.17533/udea.iee.v38n2e02 Chile 00 08 2020 00 08 2020 38 2 1. World Health Organization. 2020 2. World Health Organization. 2020 3 2009 18 19 19 2732-8. 4. 2013 113 12 12 24-31. 5. 2018 187 12 12 2596-602. 6. 2020 e1-e2. 7. 2010 160 Pt 1 Pt 1 620-4 8. 2020 29 10 10 566-9 9. 2020 10.