title: The newest gatekeepers: nurses take on the duties of primary care physicians.
authors.forename: S
authors.initials: S
authors.lastname: Campbell
mesh_terms: D003363:Cost Control; D007349:Insurance, Health, Reimbursement; D007400:Interprofessional Relations; D009722:Nurse Practitioners / Q000706:statistics & numerical data*; D017063:Outcome Assessment, Health Care; D019555:Physician-Nurse Relations; D010820:Physicians / Q000600:supply & distribution; D011320:Primary Health Care / Q000191:economics / Q000592:standards; D012017:Referral and Consultation / Q000639:trends*; D014481:United States; D000078329:Workforce