"Many specialty medical practices have incorporated physician assistants (PAs) and nurse practitioners (NPs) into their health care to improve access to services, reduce wait times, and improve quality of care. A study by the Center for the Health Professions at the University of California, San Francisco, examined these emerging models to evaluate their success and identify strategies that could be replicated. The study focused on care in three specialties with particularly high demand rates: orthopedics, gastroenterology, and dermatology." (exceprt from website).