Nurses in primary care. The new gatekeepers?
D003156:Community Mental Health Services; D004465:Economic Competition; D004471:Economics, Nursing; D006801:Humans; D009722:Nurse Practitioners / Q000639:trends*; D011320:Primary Health Care; D011364:Professional Practice; D011640:Public Policy; D012941:Social Responsibility; D014481:United States; D000078329:Workforce