1. Mor V et al. (1998) Benchmarking quality in nursing homes: the Q-Metrics system. Can J Qual Health Care 14:12–17
2. Clinical practice guideline;N. Bergstrom,1992
3. Cuddigan J, Ayello EA, Sussman C, Baranoski S (eds) (2001) Pressure ulcers in America: prevalence, incidence, and implications for the future. National Pressure Ulcer Advisory Panel, Reston, VA
4. Brooks EL, Duncan GW (1940) Effects of pressure on tissues. Arch Surg 40:696–709
5. Husain T (1953) An experimental study of some pressure effects on tissues with reference to the bed-sore problem. J Pathol Bacteriol 66:347–358