1. Centre for Global Child Health, The Hospital for Sick Children, Toronto, Ontario, Canada;
2. Centre of Excellence in Women and Child Health, Aga Khan University, Karachi, Pakistan;
3. Center for Global Health, Division of Infectious Diseases and International Health, University of Virginia School of Medicine, Charlottesville, Virginia;
4. Laboratories of Cognitive Neuroscience, Boston Children's Hospital, Boston, Massachusetts;
5. Department of Pediatrics, Harvard Medical School, Boston, Massachusetts; and
6. Human Development Program, Harvard Graduate School of Education, Cambridge, Massachusetts