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Most physicians specialize in one of the following areas: anesthesiology, family and general medicine, general internal medicine, general pediatrics, obstetrics and gynecology, psychiatry, and surgery. The greatest number of physicians are in private practice. They see patients by appointment in their offices and examining rooms, and visit patients who are confined to the hospital. In the hospital, they may perform operations or give other kinds of medical treatment. Some physicians also make calls on patients at home if the patient is not able to get to the physician's office or if the illness is an emergency.