Mayo Foundation is a charitable, not-for-profit corporation with a mission to provide the highest quality, compassionate care at a reasonable cost through a physician-led team of diverse people working together in clinical practice, education and research in a unified multi-campus system. Mayo Clinic is the first and largest integrated, not-for-profit group practice in the world. Doctors from every medical specialty work together to care for patients, joined by common systems and a philosophy of "the needs of the patient come first." More than 3,300 physicians, scientists and researchers and 46,000 allied health staff work at Mayo Clinic, which has sites in Rochester, Minn., Jacksonville, Fla., and Scottsdale/Phoenix, Ariz. Collectively, the three locations treat more than half a million people each year.