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| Notable patients at the Mayo Clinic Former U.S. Presidents, John F. Kennedy, Gerald Ford, Ronald Wilson Reagan, George Herbert Walker Bush King of Jordan, Hussein bin Talal Former President of the United Arab Emirates, Zayed bin Sultan Al Nahyan American 20th century novelist, Ernest Hemingway
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（Mayo clini）
Founded in 1863, it is the largest and most advanced comprehensive medical system in the United States based on innovative medical education and world-leading medical research. It is the first hospital for the diagnosis and treatment of intractable diseases in the world. In the 2014 U.S. News & World Report National Hospital Rankings, Mayo Medicine National Comprehensive Center ranked first.
Today, Mayo Clinic has branches in Florida and Arizona, as well as its own medical school and dozens of medical clinics covering several surrounding states. At present, it has more than 2,700 clinical experts and scientists.