<qa>  What is the name of the group that is randomized?OUTLINE: This is a partially randomized, double-blind, parallel-group study. Patients choose between epidural analgesia or patient controlled analgesia PCA for perioperative pain management. Patients for whom an epidural is contraindicated receive a PCA. Patients are assigned to 1 of 2 treatment groups. Patients in group 1 are stratified according to bowel resection surgery yes vs no and prior abdominal surgery yes vs no. 