7Sharon B,Elizabeth A. Wound care essentials Practice principles[M]. USA: Lippincott Williams & Wilkins, 2007 : 39-56.
8Bricnza E,Geyer R. Seating,positioning,and support surfaces. Wound Care Essentials : Practice Principles [ M ]. USA : Lippincott Williams & Wilkins,2007 : 203-228.
9Medical policy for pressure-reduclng support surfaces by the Medicare part B. Durable Medical Equipment Regional Carriers (DMERC).Available : https://www.noridianmedicare.com/dme/dmercdialogue/spring_2005/.
10National Pressure Ulcer Advisory Panel (NPUAP). Support Surface Initiative. NPUAP,Support surface standards initiative-terms and definitions. Available:https:// www.upuap.org, accessed June,2006.