a Joint Centre for Bioethics, University of Toronto, 88 College Street, Toronto, ON, Canada. b Centre for AIDS Programme of Research in Africa, Durban, South Africa. c School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa. Correspondence to Ross Upshur (e-mail: [email protected]). (Submitted: 10 June 2008 – Revised version received: 8 October 2008 –...