9Dennis Sewchuk, Cynthia Padula, Evelyn Osborne. Prevention and Early Detection of Pressure Ulcers in Patients Undergoing Cardiac Surgery [J]. AORN,2006,84(1) :75.
10Recommended practices for positioning the patient in the perioperativ practice setting. In Standards, Recommended Practices, and Guadelines. AORN Inc,2007:631-634.