[1] Univ Gondar, Inst Publ Hlth, Coll Med & Hlth Sci, Dept Epidemiol & Biostat, Gondar, Ethiopia
[2] Univ Gondar, Sch Med, Coll Med & Hlth Sci, Dept Human Anat, Gondar, Ethiopia
[3] Univ Gondar, Sch Med, Coll Med & Hlth Sci, Dept Physiol, Gondar, Ethiopia
[4] Wollo Univ, Sch Nursing & Midwifery, Coll Med & Hlth Sci, Dept Midwifery, Dessie, Ethiopia