Physicians and surgeons play an important role in the provision of health care in Canada. They are responsible for the promotion, maintenance, and restoration of health through the study, diagnosis, prognosis, and treatment of disease, injury, and other physical and mental impairments. As Canadian medical schools solely offer the Doctor of Medicine (M.D.) or Doctor of Medicine and Master of Surgery (M.D., C.M.) degrees, these represent the degrees held by the vast majority of physicians and surgeons in Canada, though some have a Doctor of Osteopathic Medicine (D.O.) from the United States or Bachelor of Medicine, Bachelor of Surgery (M.B., B.S.) from Europe.