“…10 studies [ 39 – 41 , 45 , 46 , 48 , 49 , 55 – 57 ] were performed on hysterectomy, 8 [ 42 – 44 , 47 , 51 , 59 – 61 ] were performed on anorectal surgery, 2 [ 52 , 58 ] were performed on orthopedic surgery, 1 [ 53 ] was performed on prostate surgery, 1 [ 50 ] was performed on spinal anaesthesia, and 1 study [ 54 ] did not indicate the type of surgery. All of the included studies used EA with or without other treatments as intervening measure, 8 of these studies [ 39 , 41 , 43 , 45 , 54 , 55 , 57 , 58 ] compared EA with usual care and physiotherapy, and 10 studies [ 40 , 42 , 46 – 49 , 51 , 53 , 56 , 59 ] compared EA with medication. 5 studies [ 44 , 50 , 52 , 60 , 61 ] set EA as intervening measure while there was no intervention in the control group.…”