Stanford Hospital and Clinis, Stanford, California, United States
Massachusetts General Hospital, Boston, Massachusetts, United States
Duke University Medical Center, Durham, North Carolina, United States
Thechnical University-Klinikum rechts der Isar, Munich, Germany
State University of New York at Stony Brook-Health Sciences Center, Stony Brook, New York, United States
University of Cincinnati-Department of Neurosurgery, Cincinnati, Ohio, United States
Cardio Centro Ticino, Servizio Cardiovasculare, Lugano, Switzerland
Kategra I Klinika Kardiolgii AM, Wroclaw, Poland
Denver VAMC, Denver, Colorado, United States
Oracle Research, Huntsville, Alabama, United States
USC Medical Center, Los Angeles, California, United States
Jacksonville Center for Clinical Research, Jacksonville, Florida, United States
University of Alberta Hospital, Edmonton, Alberta, Canada
London Health Sciences Centre-University Hospital, London, Ontario, Canada
Columbia University Medical Center, New York, New York, United States
Dr. Aldrich, Baltimore, Maryland, United States
Dr. Giuseppe Lanzino, Peoria, Illinois, United States
Dr. Horner, Indianapolis, Indiana, United States