[1] Swiss Trop & Publ Hlth Inst, Kreuzstr 2, CH-4123 Allschwil, Switzerland
[2] Univ Basel, CH-4003 Basel, Switzerland
[3] Ifakara Hlth Inst, POB 78 373, Dar Es Salaam, Tanzania
[4] Manhica Hlth Res Ctr, CP 1929, Maputo, Mozambique
[5] Res Inst Hlth Sci, 03 BP 7192, Ouagadougou 03, Burkina Faso