Patrocinio
El presente estudio recibió aportes del Department of Child and Adolescent Health and Development, WHO, Ginebra , y de Applied Research Child Health (ARCH) Project, Boston University, Boston.
Conflicto de interés
S A Qazi y O Fountaine son medicos del Department of Child and Adolescent Health and Development, WHO. D Thea es professor en el ARCH Project de Boston University. W McLeod, M Fox y J Simon trabajan e