1. From the Department of Pediatrics, Washington University School of Medicine, St Louis, MO (MAC, HS, HMC, and MJM); the College of Medicine, University of Malawi, Blantyre, Malawi (MJN and MJM); the Institut de Recherche pour le Développement, Paris, France (AB); and the Paediatric Research Centre, Tampere University Hospital, Tampere, Finland (PA).