6Apucu-Gunes U,EserI.Non-blanchable erythema as an indicator for the need for pressure ulcer prevention:a randomizedcontrolled trial[J].Clin Nurs,2007,16(2):325-335.
7Stratton RJ,Ek AC,Engfer M,et al.Enteral nutritional support in prevention and treatment of pressure ulcers:a systematic review and meta-analysis[J].Ageing Res Rev,2005,4(3):422-450.