1. PO Box 6614 Welgemoed Cape Town South Africa 7538
2. South African Medical Research Council; Cochrane South Africa; PO Box 19070 Tygerberg Cape Town South Africa 7505
3. Liverpool School of Tropical Medicine; Department of Clinical Sciences; Pembroke Place Liverpool UK L3 5QA
4. University of Cape Town; Primary Health Care Directorate; E47 OMB Groote Schuur Hospital Cape Town Western Cape South Africa 7925