Founded in 1889, Mayo Clinic has grown from a small Clinic founded by Dr. William Worrall Mayo to a top international clinical medical center with more than 55,000 doctors, nurses, scientists, students and allied medical staff. It is the largest and most well-equipped non-profit hospital in the world, with three branches in the United States: Arizona Branch, Florida Branch and Minnesota Branch. The center logo is three connected shields, which represent the three complementary fields of medical treatment, scientific research and education respectively. Its purpose is to provide the best medical care for every patient through integrated clinical practice, education and research, inspire his life hope, and safeguard his health and quality of life.