[1] Heidelberg Univ Hosp, Inst Pathol, Dept Appl Tumor Biol, Neuenheimer Feld 224, D-69120 Heidelberg, Germany
[2] Univ Gondar, Sch Med, Dept Gynaecol, Coll Med & Hlth Sci, Gondar, Ethiopia
[3] Univ Gondar, Inst Publ Hlth, Coll Med & Hlth Sci, Gondar, Ethiopia
[4] Univ Gondar, Inst Publ Hlth, Coll Med & Hlth Sci, Dabat Res Ctr Hlth & Demog Surveillance Syst, Gondar, Ethiopia