Columbia University Medical College, New York, New York, United States
Covance Clinical Laboratory Unit, Madison, Wisconsin, United States
Cardiovascular Consultants, Kansas City, Missouri, United States
The Cleveland Clinic Foundation, Cleveland, Ohio, United States
Northwestern Memorial Hospital, Chicago, Illinois, United States
Hartford Hospital, Hartford, Connecticut, United States
Yale University Medical Center, New Haven, Connecticut, United States
Emory University Hospital, Atlanta, Georgia, United States
Brigham & Women's Hospital, Boston, Massachusetts, United States
University Hospital Case Medical Center, Cleveland, Ohio, United States
UCLA Medical Center, Los Angeles, California, United States
John Hopkins University, Baltimore, Maryland, United States
UCLA Medical Center, Los Angeles, California, United States
York Hospital, York, Pennsylvania, United States
University of Texas Medical Center, Galveston, Texas, United States
Northwestern University, Chicago, Illinois, United States
University of Arizona, Tucson, Arizona, United States
University of Nebraska Medical Center, Omaha, Nebraska, United States
Saint Lukes Mid America Heart Institute, Kansas City, Missouri, United States
Local Institution, Glasgow, Scotland, United Kingdom