[1] Univ Gondar, Inst Publ Hlth, Coll Med & Hlth Sci, Dept Epidemiol & Biostat, Gondar, Ethiopia
[2] Addis Ababa Univ, Coll Med & Hlth Sci, Sch Med, Dept Obstet & Gynecol, Addis Ababa, Ethiopia
[3] Univ Gondar, Coll Med & Hlth Sci, Dept Anat, Gondar, Ethiopia
[4] Univ Gondar, Coll Med & Hlth Sci, Dept Biochem, Gondar, Ethiopia
[5] Univ Gondar, Coll Business & Econ, Dept Management, Gondar, Ethiopia