1. University of Nairobi; Institute of Tropical and Infectious Diseases (UNITID); P.O. BOX 19676 - 00202 Nairobi Kenya
2. South African Medical Research Council; South African Cochrane Centre; PO Box 19070 Tygerberg Western Cape South Africa 7505
3. Stellenbosch University; Centre for Evidence-based Health Care; PO Box 19063 Tygerberg South Africa 7505