Teaching Health Centers are located in Community Health Centers to provide graduate medical education — that period of residency training after graduation from medical school that is required to practice as a physician in the United States. The content and effectiveness of this training are important factors in determining the cost and quality of health care. And the location of this training affects the size and geographic distribution of the physician workforce: Those who train in underserved areas are likely to remain in the same or similar settings, providing access to competent care for rural and inner city patients.