2072-8174 2072-8174 S2072-81742018000100001 10.18004/rdn2018.0010.01.001-003 Paraguay 00 06 2018 00 06 2018 10 1 1 3 1 2018 2 CD010768 2 2017 95 12 12 831-841F 3 World Health Organization 2002 4 2013 3 3 3 193-9 5 Romero de Molinas LG 2018 10 1 1 092-122