[1] Kilimanjaro Christian Med Univ Coll KCMUCo, Inst Publ Hlth, Dept Epidemiol & Biostat, Moshi, Tanzania
[2] Amref Hlth Africa, Dar Es Salaam, Tanzania
[3] Dodoma Univ, Coll Hlth Sci, Dept Publ Hlth, Dodoma, Tanzania
[4] Muhimbili Univ Hlth & Allied Sci, Sch Nursing, Dept Community Hlth Nursing, Dar Es Salaam, Tanzania
[5] Muhimbili Univ Hlth & Allied Sci, Sch Publ Hlth & Social Sci, Dept Dev Studies, Dar Es Salaam, Tanzania
[6] Lund Univ, Dept Translat Med, Register Based Epidemiol, Lund, Sweden
[7] KCMUCo, POB 2240, Moshi, Tanzania