[1] Univ Basel, CH-4003 Basel, Switzerland
[2] Swiss Trop & Publ Hlth Inst, Dept Epidemiol & Publ Hlth, CH-4002 Basel, Switzerland
[3] Swiss Trop & Publ Hlth Inst, Dept Med Serv & Diagnost, CH-4002 Basel, Switzerland
[4] Swiss Trop & Publ Hlth Inst, Dept Med Parasitol & Infect Biol, CH-4002 Basel, Switzerland
[5] Univ Zurich, Inst Social & Prevent Med, CH-8001 Zurich, Switzerland