[1] Inst Trop Med, Antwerp, Belgium
[2] Swiss Trop & Publ Hlth Inst, Basel, Switzerland
[3] Univ Basel, Basel, Switzerland
[4] Programme Natl Lutte Trypanosomiase Humaine Afric, Kinshasa, DEM REP CONGO
[5] Univ Liverpool Liverpool Sch Trop Med, Liverpool, Merseyside, England