University of the Philippines, Manila - Institute of Child Health and Human Development, University of the Philippines, Manila - Institute of Child Health and Human Development, Fudan University, 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, 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, University of the Philippines, Manila - Institute of Child Health and Human Development, University of the Philippines, Manila - Institute of Child Health and Human Development, Mariano Marcos Memorial Hospital and Medical Center, Vicente Sotto Memorial Medical Center, Vicente Sotto Memorial Medical Center, Davao Regional Medical Center, Research Institute for Tropical Medicine, Research Institute for Tropical Medicine, University of Oxford, Fudan University - Key Laboratory of Medical Molecular Virology (MOE/NHC/CAMS) and University of the Philippines, Manila - Institute of Child Health and Human Development