Founded in 1925, Memorial Hermann-Texas Medical Center has set new standards of care in Texas and the nation through advances in the practice of medicine. As the primary teaching hospital for the University of Texas Medical School at Houston, it provides care in heart, neuroscience, orthopedics, women's health, general surgery and organ transplantation. It is one of two certified Level 1 trauma centers in the greater Houston area and provides 24-hour emergency and trauma care to more than 40,000 patients. Memorial Hermann Life Flight air ambulance service operates a fleet of three helicopters, providing emergency rescue and air transport services to a multi-county area. Memorial-Hermann-Texas Medical Center is part of the Memorial Hermann Healthcare System, one of the largest nonprofit health care networks in the United States.