[1] Ifakara Hlth Inst, Biomed, Morogoro, Tanzania
[2] Minist Hlth, Natl Aids Control Program, Dar Es Salaam, Tanzania
[3] St Francis Referral Hosp, Morogoro, Tanzania
[4] Univ Basel, Basel, Switzerland
[5] Swiss Trop & Publ Hlth Inst, Allschwil, Switzerland
[6] Univ Hosp Basel, Div Infect Dis & Hosp Epidemiol, Basel, Switzerland