[1] World Hlth Org, Geneva, Switzerland
[2] US Ctr Dis Control & Prevent Collaborat, Thailand Minist Publ Hlth, Nonthaburi, Thailand
[3] US Ctr Dis Control & Prevent, Atlanta, GA USA
[4] London Sch Hyg & Trop Med, Dept Clin Res, London WC1, England
[5] Univ Zambia, ZAMBART Project, Lusaka, Zambia
[6] Aurum Inst Hlth Res, Johannesburg, South Africa
[7] Bill & Melinda Gates Fdn, Seattle, WA USA
[8] Albert Einstein Coll Med, New York, NY USA
[9] Univ Cape Town, Dept Med, ZA-7700 Rondebosch, South Africa
[10] Univ Cape Town, Desmond Tutu HIV Ctr, ZA-7700 Rondebosch, South Africa