[1] Int Union TB & Lung Dis, Paris, France
[2] London Sch Hyg & Trop Med, Dept Infect & Trop Med, London WC1, England
[3] Med Sans Frontieres, Dept Med, Brussels, Belgium
[4] Univ Cape Town, Desmond Tutu HIV Ctr, ZA-7925 Cape Town, South Africa
[5] Boston Univ, Ctr Int Hlth & Dev, Boston, MA 02215 USA
[6] Wits Hlth Consortium, Hlth Econ & Epidemiol Res Off, Johannesburg, South Africa