Mercer University School of Medicine, Macon, Georgia, United States
John's Hopkins University, Baltimore, Maryland, United States
Rush-Presbytarian-St Luke's Medical Center, Chicago, Illinois, United States
Herron Medical Center, Ltd., Chicago, Illinois, United States
Midwest Institute for Clinical Research Inc., Indianapolis, Indiana, United States
nTouch Research, Houston, Texas, United States
Spartanburg Medical Research, Spartanburg, South Carolina, United States
Harold B. Betton, M.D., Little Rock, Arkansas, United States
GFI Pharmaceuticals, Evansville, Indiana, United States
St. Thomas Health Services, Nashville, Tennessee, United States
Presbyterian Hospital of Dallas, Dallas, Texas, United States
Department of Respiratory Medicine, Toronto, Ontario, Canada
Hunter Holmes McGuire Medical Center, Richmond, Virginia, United States
Hines Veterans Administration Hospital, Hines, Illinois, United States
Harbor-UCLA Research and Education Institute, Torrance, California, United States
St. Francis Hospital and Medical Center, Hartford, Connecticut, United States
Temple University Hospital, Philadelphia, Pennsylvania, United States
Rehabilitationszentrum für Herz- und Kreislauferkrankungen, Bad Tatzmannsdorf, Austria
Landeskrankenhaus Graz West, Graz, Austria
Univ.-Klinik für Innere Medizin III, Wien, Austria
Boehringer Ingelheim Investigational Site, Salt Lake City, Utah, United States
Hampton VA Medical Center, Hampton, Virginia, United States
Carl T. Hayden VA Medical Center, Phoenix, Arizona, United States
Chang Gung Memorial Hospital, Taipei, Taiwan
Boehringer Ingelheim Investigational Site, Zwickau, Germany
MEDARS GmbH, Berlin, Germany
Johannes-Gutenberg-Universität Mainz, Mainz, Germany