[1] Heidelberg Univ, Inst Publ Hlth, Heidelberg, Germany
[2] Navrongo Hlth Res Ctr, Navrongo, Ghana
[3] Univ Ghana, Sch Publ Hlth, Accra, Ghana
[4] Muhimbili Univ Hlth & Allied Sci, Sch Publ Hlth & Social Sci, Dept Behav Sci, Dar Es Salaam, Tanzania
[5] Med Univ, Surg Clin, Pleven, Bulgaria
[6] Univ Heidelberg Hosp, Dept Clin Pharmacol & Pharmacoepidemiol, Med Klin, Krehl Klin, Heidelberg, Germany