[1] Swiss Trop & Publ Hlth Inst, Epidemiol & Publ Hlth, Basel, Switzerland
[2] Univ Basel, Basel, Switzerland
[3] Ctr Suisse Rech Sci Cote Ivoire, Abidjan, Cote Ivoire
[4] Noguchi Mem Inst Med Res, Accra, Ghana
[5] Minist Sante, Programme Natl Lutte Onchocercoses & Autres Malad, Republ Guineed Res, Conakry, Guinea
[6] Univ Liverpool, Liverpool Sch Trop Med, Ctr Neglected Trop Dis, Liverpool L3 5QA, Merseyside, England