1. Centre for Medical Ethics and Law, Faculty of Medicine and Health Sciences, University of Stellenbosch, PO Box 19063, Tygerberg 7505, Cape Town, South Africa.
2. Hunter New England Population Health, Wallsend, Australia.
3. Centre for Human Bioethics, Monash University, Melbourne, Australia.
4. The George Washington University, Washington, United States of America.
5. Expanded Programme on Immunization, World Health Organization, Geneva, Switzerland.
6. Wits Reproductive Health and HIV Institute, University of the Witwatersrand, Johannesburg, South Africa.
7. Hunter Medical Research Institute, Wallsend, Australia.