1. Department of Pediatrics, Alpert Medical School, Brown University, Providence, Rhode Island, USA; Center for International Health Research, Rhode Island Hospital, Providence, Rhode Island, USA
2. Department of Health Care Quality, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
3. Socios En Salud (Partners In Health), Lima, Peru
4. Instituto Nacional de Salud del Niño, Lima, Peru
5. Socios En Salud (Partners In Health), Lima, Department of Global Health and Social Medicine, Harvard Medical School, Boston, USA; Division of Global Health Equity, Brigham and Women's Hospital, Boston, Massachusetts, USA