Funding

We are grateful and indebted to the funding agencies that have supported our research over the years which include: Deutsche Forschungsgemeinschaft (German Research Foundation); National Research Foundation; Poliomyelitis Research Foundation, Cancer Association of South Africa, South African Medical Research Council, Medical Research Council, University of the Witwatersrand, New Partneship for Africa¡¯s Development, Wellcome Trust, Japan Society for the Promotion of Science, The Medical Research Foundation and The Africa Research Excellence Fund, the Swedish International Development Cooporation Agency (SIDA) in partnership with the Organization for Women in Science for the Developing World (OWSD) and the Loreal-UNESCO For Women in Science.