1. a Columbia University, HIV Center for Clinical and Behavioral Studies , New York , US
2. b Clinical Trials & Surveys Corp , Baltimore , US
3. c Northwestern University/Children's Memorial Hospital , Chicago , US
4. d National Institute of Mental Health , Bethesda , US
5. e University of Illinois at Chicago , Chicago , US
6. f Texas Children's Hospital , Houston , US
7. g Department of Pediatrics , Columbia University , New York , US
8. h University of Puerto Rico School of Medicine , San Juan , Puerto Rico
9. i State University of New York at Brooklyn , New York , US
10. j National Institute of Child Health and Human Development , Bethesda , US