Bin-Gadeem FH. Laparoscopic cholecystectomy for gallbladder stone disease:preoperative factors associated with difficult operations. Univ. Aden J. Nat. and Appl. Sc. [Internet]. 2021 Apr. 30 [cited 2024 May 9];25(1):179-86. Available from: https://uajnas.adenuniv.com/index.php/uajnas/article/view/116