Victor Musiime1, Andrew J Prendergast2. 1. Makerere University College of Health Sciences, Kampala, Uganda; Joint Clinical Research Centre, Kampala, Uganda. Electronic address: musiimev@yahoo.co.uk. 2. Blizard Institute, Queen Mary University of London, UK; Zvitambo Institute for Maternal and Child Health Research, Harare, Zimbabwe; Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA.