Jill Tucker, RN says:

“The oncoming shortage of doctors can be addressed by allowing Nurse Practitioners to take on some of the general duties currently performed by doctors. But a New England Journal of Medicine survey shows a sharp divide between nurses and doctors about the perceived quality of patient care provided by nurse practitioners. One concern among doctors is that nurse education and training can vary from state to state, while physician schooling and training is more consistent across the country.”
Doctors Doubt Nurses Skills, Survey Finds

Vitals.NBCnews.com  May 15, 2013