1. Department of Pediatrics, Yale School of Medicine, New Haven, CT;
2. Department of Biostatistics, Yale School of Public Health, New Haven, CT;
3. Department of Child Health, School of Medical Sciences, Kwame Nkrumah University of Science and Technology and Komfo Anokye Teaching Hospital, Kumasi, Ghana;
4. Department of Child Health, University of Ghana Medical School and Korle-Bu Teaching Hospital Accra, Ghana;
5. Department of Medicine, University of Ghana Medical School and Korle-Bu Teaching Hospital Accra, Ghana; and
6. Johns Hopkins School of Nursing, Baltimore, MD.