The Johns Hopkins Hospital engages in researching, teaching, and providing medical services to patients in the United States and internationally. It offers treatment services in various areas, including allergy and clinical immunology, anesthesiology/critical care medicine, brain tumors, cancer, cardiac surgery, cardiology, children health, dentistry, dermatology, ear, nose and throat, emergency medicine, endocrinology, eyes, facial plastic and reconstructive surgery, gastroenterology, gynecology and obstetrics, head and neck surgery, hearing, heart, hematology, infectious diseases, internal medicine, and liver tumors. The company's treatment areas also include medicine, nephrology, neurology and neurosurgery, oncology (cancer), ophthamology (eyes), oral surgery, orthopedic surgery, otolaryngology (head and neck surgery)/ear, nose and throat, pathology, pediatrics, pediatric oncology, physical medicine/rehabilitation, plastic and reconstructive surgery, psychiatry/behavioral sciences, pulmonary/critical care medicine, radiation oncology, radiology, rheumatology, social work (medical and surgical), surgery, and urology, as well as vascular medicine, surgery, and endovascular therapy. In addition, The Johns Hopkins Hospital provides education services for medical students, scientists, health care professionals, and the public; conducts biomedical research; and provides patient-centered medicine to prevent, diagnose, and treat human illness. The company was founded in 1889 and is based in Baltimore, Maryland.