1. Division of Specialised Education, University of the Witwatersrand, 1 Jan Smuts Avenue, Johannesburg 2001, Republic of South Africa
2. AIDS Training and Information Centre, South African Institute for Medical Research, P.O. Box 1038, Johannesburg 2000, Republic of South Africa
3. Department of Psychology, University of the Witwatersrand, 1 Jan Smuts Avenue, Johannesburg 2001, Republic of South Africa