Cleveland Clinic, Cleveland, Ohio, United States
Stanford University Medical Center, Stanford, California, United States
UCLA School of Medicine, Los Angeles, California, United States
Mayo Clinic, Jacksonville, Florida, United States
Stanford University Medical Center, Stanford, California, United States
University of Florida Health Sciences Center, Gainesville, Florida, United States
Cleveland Clinic, Cleveland, Ohio, United States
University of California at San Francisco, San Francisco, California, United States
University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, United States