Please refer to this study by its ClinicalTrials.gov identifier: NCT00047437
| University of Alabama at Birmingham |
| Birmingham, Alabama, United States, 35294 |
| Heart Clinic Arkansas |
| Little Rock, Arkansas, United States, 72205 |
| Ahmanson-University of California Los Angeles |
| Los Angeles, California, United States, 90095 |
| University of California at San Diego Medical Center |
| San Diego, California, United States, 92103 |
| Memorial Heart Institute |
| Long Beach, California, United States, 90806 |
| University of California, Davis Medical Center |
| Sacramento, California, United States, 95817 |
| University of Colorado Health Sciences Center |
| Denver, Colorado, United States, 80262 |
| Heart and Vascular Clinic of Northern Colorado |
| Fort Collins, Colorado, United States, 80528 |
| Hartford Hospital |
| Hartford, Connecticut, United States, 06102-5037 |
| Veterans Affairs Medical Center |
| Washington, District of Columbia, United States, 20422 |
| Mayo Clinic |
| Jacksonville, Florida, United States, 32216 |
| University of Florida |
| Gainesville, Florida, United States, 32610 |
| Southwest Florida Heart Group |
| Fort Myers, Florida, United States, 33919 |
| Emory University Hospital |
| Atlanta, Georgia, United States, 30322 |
| Morehouse School of Medicine |
| Atlanta, Georgia, United States, 30310 |
| Heart and Lung Group of Savannah |
| Savannah, Georgia, United States, 31405 |
| Cardiovascular Associates of Augusta |
| Augusta, Georgia, United States, 30901 |
| Northwestern University Medical Center |
| Chicago, Illinois, United States, 60611 |
| University of Chicago Hospitals |
| Chicago, Illinois, United States, 60637 |
| Central DuPage Hospital |
| Winfield, Illinois, United States, 60190 |
| The Care Group, LLC |
| Indianapolis, Indiana, United States, 46260 |
| University of Iowa Hospital and Clinics |
| Iowa City, Iowa, United States, 52242-1081 |
| University of Louisville |
| Louisville, Kentucky, United States, 40292 |
| Ochsner Clinic Foundation |
| New Orleans, Louisiana, United States, 70121 |
| Johns Hopkins University Medical Center |
| Baltimore, Maryland, United States, 21287 |
| University of Maryland |
| Baltimore, Maryland, United States, 21201 |
| Boston Medical Center |
| Boston, Massachusetts, United States, 02118 |
| Brigham and Women's Hospital |
| Boston, Massachusetts, United States, 02120-1613 |
| William Beaumont Hospital |
| Royal Oak, Michigan, United States, 48073 |
| Saint John Hospital and Medical Center |
| Detroit, Michigan, United States, 48236 |
| Henry Ford Hospital |
| Detroit, Michigan, United States, 48202 |
| University of Minnesota |
| Minneapolis, Minnesota, United States, 55455 |
| Mayo Clinic |
| Rochester, Minnesota, United States, 55905 |
| Mid America Heart Institute-Saint Luke's Hospital |
| Kansas City, Missouri, United States, 64111 |
| Washington University School of Medicine |
| St. Louis, Missouri, United States, 63110 |
| Glacier View Cardiology, P.C. |
| Kalispell, Montana, United States, 59901 |
| Bryan Lincoln General Hospital |
| Lincoln, Nebraska, United States, 68516 |
| University of Medicine & Dentistry of New Jersey |
| New Brunswick, New Jersey, United States, 08901 |
| Hackensack University Medical Center |
| Westwood, New Jersey, United States, 07601 |
| University of New Mexico |
| Albuquerque, New Mexico, United States, 87131-0001 |
| University of Rochester |
| Rochester, New York, United States, 14624 |
| Saint Francis Hospital |
| Roslyn, New York, United States, 11576 |
| University of North Carolina School of Medicine |
| Chapel Hill, North Carolina, United States, 17517 |
| Duke University Medical Center |
| Durham, North Carolina, United States, 27710 |
| Wake Forest University School of Medicine |
| Winston-Salem, North Carolina, United States, 27157 |
| Northeast Medical Center |
| Concord, North Carolina, United States, 28025 |
| University Hospitals of Cleveland |
| Cleveland, Ohio, United States, 44106 |
| University of Cincinnati |
| Cincinnati, Ohio, United States, 45267-0542 |
| Medical University of Ohio |
| Toledo, Ohio, United States, 43614-2598 |
| Davis Heart and Lung Research Institute |
| Columbus, Ohio, United States, 43210-1252 |
| University of Oklahoma Health Sciences Center |
| Oklahoma City, Oklahoma, United States, 73104 |
| Oregon Health & Sciences University |
| Portland, Oregon, United States, 97239 |
| University of Pennsylvania |
| Philadelphia, Pennsylvania, United States, 19104 |
| Temple University Hospital |
| Philadelphia, Pennsylvania, United States, 19140 |
| University of Pittsburgh Medical Center |
| Pittsburgh, Pennsylvania, United States, 15213 |
| Geisinger Medical Center |
| Danville, Pennsylvania, United States, 17822 |
| Saint Thomas Hospital |
| Nashville, Tennessee, United States, 37205 |
| Vanderbilt University Medical Center |
| Nashville, Tennessee, United States, 37212 |
| Medical City Dallas Hospital |
| Dallas, Texas, United States, 75230 |
| Baylor Heart and Vascular Hospital |
| Dallas, Texas, United States, 75426 |
| LDS Hospital |
| Salt Lake City, Utah, United States, 84143 |
| Lynchburg General Hospital |
| Lynchburg, Virginia, United States, 24501 |
| University of Washington Medical Center |
| Seattle, Washington, United States, 98195-6310 |
| University of Wisconsin Madison |
| Madison, Wisconsin, United States, 53792 |
| Aurora Health Care |
| Milwaukee, Wisconsin, United States, 53215 |
| University of Calgary |
| Calgary, Alberta, Canada, T2N 4N1 |
| University of Manitoba Health Sciences Center |
| Winnipeg, Manitoba, Canada, R2H 2A6 |
| Queen Elizabeth II Health Sciences Center |
| Halifax, Nova Scotia, Canada, B3K6A3 |
| London Health Sciences Center |
| London, Ontario, Canada, N6A 4G5 |
| Saint Michaels Hospital |
| Toronto, Ontario, Canada, M5B 1W8 |
| Hamilton General Hospital |
| Hamilton, Ontario, Canada, L8L 2X2 |
| Toronto General Hospital |
| Toronto, Ontario, Canada, M5T 2S8 |
| Montreal Heart Institute |
| Montreal, Quebec, Canada, H1T 1N6 |
| Laval Hospital |
| Sainte Foy, Quebec, Canada, G1V 4G5 |
| Hopital Brabois |
| Vandoeuvre Les Nancy, France, 54500 |
| Hopital Henri Mondor-Service de C |
| Creteil, France, 94010 |
| CHU de Caen |
| Caen, France, 14000 |
| Hopital Beaujon Cardiologie |
| Clichy, France, 92110 |
| Centre Cardiologie du Nord |
| Saint Denis, France, 93200 |
| Hopital Broussais |
| Paris, France, 75014 |