The ecology of group medical practice in the United States.
D004463:Ecology; D005380:Financing, Government; D005843:Geography; D006123:Group Practice; D006761:Hospitals / Q000600:supply & distribution; D006801:Humans; D007348:Insurance, Health; D007396:Internship and Residency; D010820:Physicians / Q000600:supply & distribution; D011153:Population; D011156:Population Density; D011364:Professional Practice; D012044:Regression Analysis; D012959:Socioeconomic Factors; D013223:Statistics as Topic; D014481:United States