How ORs manage on-call varies by local market.
Patterson
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D006801:Humans; D009741:Nursing Staff, Hospital / Q000458:organization & administration* / Q000639:trends; D009873:Operating Rooms / Q000458:organization & administration*; D010561:Personnel Staffing and Scheduling / Q000458:organization & administration* / Q000639:trends; D014481:United States