Cardiothoracic Center Liverpool, Liverpool, United Kingdom
University of Freiburg, Albert-Ludwigs-Universitätskliniken, Freiburg, Germany
HOPITAL COCHIN, René Descartes University, Paris, France
New York Presbyterian Hospital/Columbia University Medical Center, New York, New York, United States
University Hospital of North Staffordshire, Newcastle under Lyme, United Kingdom
Manchester Royal Infirmary, Manchester, United Kingdom
Université de Lille, Hôpital cardiologique, Lille, France
Herz-zentrum Bad Krozingen, Bad-Krozingen, Germany
K.U. Leuven, Leuven, Belgium
University Hospital, Tübingen, Germany
Texas Heart Institute, Houston, Texas, United States
Scripps Clinic and Research, LaJolla, California, United States