1. Department of Pediatrics, Faculdade de Medicina da Universidade de São Paulo (FMUSP), São Paulo, Brazil
2. Laboratório de Investigação Médica 23 HC FMUSP, São Paulo, Brazil
3. Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
4. Swiss Tropical and Public Health Institute (TPH) and University of Basel, Basel, Switzerland