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2. Evidence-based medicine: what it is and what it isn't;Sackett;British Medical Journal,1996
3. An investigation of the current methods used in nursing for the care of patients with established pressure sores;David,1983
4. Pathogenesis of pressure sores in elderly patients with hip fracture;Versluysen,1985
5. The financial costs of pressure sores to the National Health Service: a case study;Clark,1993