There is no pure air, there is no pure water, and there are no pure nursing care delivery models!
Curran
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D006801:Humans; D016294:Models, Nursing; D009745:Nursing, Supervisory; D009746:Nursing, Team / Q000592:standards*; D010347:Patient Care Planning / Q000592:standards*; D011321:Primary Nursing / Q000592:standards*