1. Department of Behavioural Medicine, University of KwaZulu-Natal, Durban, South Africa
2. Department of Psychology, University of the Free State, Bloemfontein, South Africa
3. Department of Psychology, Virginia Commonwealth University, Richmond, Virginia, USA
4. San Francisco Veterans Affairs Health Care System, San Francisco, California, USA
5. School of Social Work, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA