Fig. 1From: The effects of fentanyl, oxycodone, and butorphanol on gastrointestinal function in patients undergoing laparoscopic hysterectomy: a prospective, double-blind, randomized controlled trialConsort flow diagram. Abbreviations: B = butorphanol; CONSORT = Consolidated Standards of Reporting Trials; F = fentanyl; IV-PCA = intravenous patient-controlled analgesia; O = oxycodone.Back to article page