Johns Hopkins Hospital (JHH) is the teaching hospital and biomedical research facility of Johns Hopkins School of Medicine in Baltimore, Maryland. Incorporated in 1867 and opened in 1889, Johns Hopkins Hospital and its school of medicine are considered to be the founding institutions of modern American medicine and the birthplace of numerous famed medical traditions, including rounds, residents, and house staff. Several medical specialties were founded at the hospital, including neurosurgery by Harvey Cushing and Walter Dandy, cardiac surgery by Alfred Blalock and Vivien Thomas, and child psychiatry by Leo Kanner. Johns Hopkins Children's Center, which serves infants, children, teens, and young adults aged 0–21, is attached to the hospital.