2Capon A, Pavoni N, Mastromattei A,et al. Pressure ulcer risk in long term units: prevalence and associated factors [J]. J Adv Nurs,2007,58(3) :263 272.
3Bergstrom N, Braden BJ, l.aguzza A,et al. The Braden scale for Predicting Pressure sore Risk [J]. Nurs Res, 1987,36 (4) : 205 210.