The borough is home to two large NHS hospitals: Chase Farm Hospital, run by the Royal Free London NHS Foundation Trust, and North Middlesex Hospital, run by the North Middlesex University Hospital NHS Trust. There are also several smaller hospital-affiliated health centers: Park House Medical Centre, Queen's Health Center, and St Thomas' Hospital. Chase Farm and North Middlesex are the only two hospitals in England that offer all four medical specialties recognized by the UK medical profession: medicine, surgery, obstetrics and gynecology (obstetrics for pregnant women), and psychiatry. The other health centers offer only some of these services. However, even if a hospital does not have every specialty center, most major operations are done there instead at one of the specialized facilities. In fact, according to the Royal Free London NHS Foundation Trust, about 70% of its patients are treated at sites other than its own building. North Middlesex operates a minor injuries unit near its main entrance on Park Road. This service is available 24 hours a day, seven days a week. It can treat people who have been involved in car accidents, falls, violence-related injuries, and other incidents that do not require admission to a hospital but which may still be serious enough to need medical attention.