Pillows.
D001510:Bed Rest / Q000009:adverse effects / Q000451:nursing*; D001512:Bedding and Linens / Q000592:standards; D015400:Clinical Nursing Research / Q000379:methods*; D004867:Equipment Design; D006801:Humans; D003668:Pressure Ulcer / Q000209:etiology / Q000517:prevention & control*