title: How lengths of office visits vary when primary care practices employ physician assistants.
mesh_terms: D004526:Efficiency; D006801:Humans; D007484:Iowa; D010823:Physician Assistants; D011320:Primary Health Care / Q000458:organization & administration*; D011364:Professional Practice / Q000458:organization & administration*; D012044:Regression Analysis; D013996:Time and Motion Studies