[1] Helmholtz Ctr Infect Res, Dept Epidemiol, Braunschweig, Germany
[2] PhD Programme Epidemiol, Braunschweig, Germany
[3] Hannover Med Sch, Hannover, Germany
[4] Swiss Trop & Publ Hlth Inst, Allschwil, Switzerland
[5] Univ Basel, Basel, Switzerland
[6] Univ Ghana, Ghana Field Epidemiol & Lab Training Programme, Accra, Ghana
[7] Ghana Hlth Serv, Publ Hlth Div, Accra, Ghana
[8] German Ctr Infect Res, Braunschweig, Germany
[9] Helmholtz Ctr Infect Res, Dept Epidemiol, Inhoffenstr 7, D-38124 Braunschweig, Germany