Fig. 1From: Programmed intermittent epidural bolus versus continuous epidural infusion for postoperative analgesia after major abdominal and gynecological cancer surgery: a randomized, triple-blinded clinical trialCONSORT Flowchart. *Initial, randomization of 90 patients was planned. During study period, further ethical permission was given for in total 110 patients due to an unexpected higher rate of drop-outs and protocol violations. For details, see textBack to article page