Asaad Oleiwi Khalaf, Ahmed Qasim Zighir, and Jassim Mohamed Khalaf, “LAPAROSCOPIC CHOLECYSTECTOMY AND FIND OUT RISK OPERATOR FOR CONVERSION IN AL- RAMADI TEACHING HOSPITAL RETROSPECTIVE ANALYSIS”, Wor.Bul.Pub.Helt., vol. 7, pp. 7-14, Feb. 2022.