[1] Inst Trop Med, Dept Parasitol, B-2000 Antwerp, Belgium
[2] Ctr Muraz, IRSS, Muraz, Burkina Faso
[3] Univ Malawi, Coll Med, Blantyre, Malawi
[4] Wame Nkrumah Univ, Ndola, Zambia
[5] Trop Dis Res Ctr, Dept Clin Sci, Ndola, Zambia
[6] Muheza Designated Dist Hosp, Natl Inst Med Res, Tanga, Tanzania