“…The effect of subhepatic drainage on postoperative pain in patients who underwent laparoscopic cholecystectomy has been investigated by previous studies [ 13 ]. In the majority of previous studies, subhepatic drainage had no effect on postoperative pain after laparoscopic cholecystectomy [ 15 , 16 , 18 , 19 ], which is inconsistent with our findings. Nonetheless, in most of the previous studies, postoperative pain was assessed 24 h after surgery.…”