Patients' satisfaction with post-operative pain management in Ayder Comprehensive Specialized Hospital, Ethiopia: a cross-sectional study. - Alema NM; Asgedom SW; Welegebrial BG; Atey TM; Araya EM; Gebremedhin H; Demsie DG; Werid WM; Araya H; Mulu A; Hailesilase GG (The Pan African medical journal, 2023)