1. Recommended practices for positioning the patient in the perioperative practice setting,2010
2. The lithotomy position in colon surgery: postoperative complications;Graling;AORN J,1992
3. AORN bariatric surgery guideline,2010
4. Positioning the patient for surgery;Heizenroth,2008
5. AORN guidance statement: Safe patient handling and movement in the perioperative setting,2010