University of the Philippines, Manila - Institute of Child Health and Human Development, University of the Philippines, Manila - Institute of Child Health and Human Development, affiliation not provided to SSRN, University of Illinois at Urbana-Champaign, University of the Philippines, Manila - Institute of Child Health and Human Development, University of the Philippines, Manila - Institute of Child Health and Human Development, University of the Philippines Manila - Institute of Child Health and Human Development, Research Institute for Tropical Medicine, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, University of the Philippines, Manila - Institute of Child Health and Human Development and University of the Philippines, Manila - Institute of Child Health and Human Development