1. Department of Epidemiology Columbia University Mailman School of Public Health New York New York USA
2. School of Nursing and Public Health University of Kwa‐Zulu Natal Durban South Africa
3. HIV Center for Clinical and Behavioral Studies at Columbia University and New York State Psychiatric Institute New York New York USA
4. Department of Pediatrics Nelson Mandela University Port Elizabeth South Africa
5. Department of Pediatrics, College of Physicians & Surgeons Columbia University New York New York USA