1. Department of Psychiatry, Rhode Island Hospital, and the Department of Psychiatry and Human Behavior, Alpert Medical School of Brown University, Providence, Rhode Island.
2. South African Medical Research Council and the University of Cape Town, Cape Town, South Africa.
3. School of Public Health, Brown University, Providence, Rhode Island.
4. Department of Psychiatry, Rhode Island Hospital, Providence, Rhode Island.
5. University of Cape Town, Cape Town, South Africa, and the School of Public Health, Brown University, Providence, Rhode Island.
6. South African Medical Research Council, Cape Town, South Africa.
7. An independent consultant.