The impact of combined administration of ropivacaine and dexamethasone on postoperative analgesia in perianal surgery with pudendal nerve block under ultrasound guidance: a prospec... oleh Tao-Ran Yang, Tao-Ran Yang, Dan Pu, Yan Cheng, Yan Cheng, Cheng-Xi Fan, Cheng-Xi Fan, Ya-Jun Hu, Ya-Jun Hu, Ru-Rong Wang, Ru-Rong Wang, Ru-Rong Wang, Xue-Han Li, Xue-Han Li