1. Yaoundé Central Hospital; Centre for the Development of Best Practices in Health (CDBPH); Henri Dunant Avenue PO Box 87 Yaoundé Cameroon
2. McMaster University; Department of Clinical Epidemiology and Biostatistics; Hamilton ON Canada
3. University of Cape Town; Primary Health Care Directorate; E47 OMB Groote Schuur Hospital Cape Town Western Cape South Africa 7925
4. National Institute of Allergy and Infectious Diseases; Laboratory of Clinical Infectious Diseases; 2953 TERRACE DR Bethesda MD USA 20892
5. University of California, San Francisco; Global Health Sciences; 50 Beale Street Suite 1200 San Francisco California USA 94105
6. Cape Town South Africa
7. Medical Research Council; Alcohol, Tobacco and Other Drug Research Unit; Francie van Zijl Drive Tygerberg South Africa 7505