National Pressure Ulcer Advisory Panel. Pressure Ulcer Category/Staging Illustrations. [cited 2014 September 3rd] ; Available from : http://www.npuap.org/resources/educational-and-clinical-resources/pressure-ulcer-categorystaging-illustrations/
Sanada H, Nagakawa T, Yamamoto M, Higashidani K, Tsuru H, Sugama J : The role of skin blood flow in pressure ulcer development during surgery. Adv Wound Care 1997 ; 10 (6) ; 29-34.
Tschannen D, Bates O, Talsma A, Guo Y ; Patientspecific and surgical characteristics in the development of pressure ulcers. Am J Crit Care 2012 ; 21 (2) 116-125.
Sullivan R : A two-year retrospective review of suspected deep tissue injury evolution in adult acute care patients ?. Ostomy Wound Manage 2013 ; 59 (9) ; 30-39.