The University of California, San Francisco Medical Center is a hospital in research and a teaching hospital in San Francisco, California. It is one of the leading hospitals in the United States and with the UCSF School of Medicine has been the site of various breakthroughs in all specialties of medicine. Patients with complex diseases from around the world seek treatment at UCSF Medical Center. With campuses located at Parnassus Heights, Mount Zion and Mission Bay, UCSF Medical Center is affiliated with the University of California, San Francisco. It has been ranked as the 7th-best overall medical center in the United States by U.S.News & World Report. The following specialties were ranked in the top 10: diabetes and endocrinology (5); neurology and neurosurgery (5); cancer (6); urology (7); nephrology (7); gynecology (8); geriatrics (8); rheumatology (10). A new 43-acre (170,000 m2) campus in the Mission Bay neighborhood opened on February 1, 2015. The medical center received a philanthropic donation of $100 million from Chuck Feeney in February 2015, the largest gift by an individual in the history of the UC system. The 600-bed Parnassus center serves as the main campus and houses the Langley Porter Psychiatric Institute, the 180-bed UCSF Childrens Hospital, extensive research labs, and the main Dental and Nursing buildings.