University of DĂĽsseldorf, DĂĽsseldorf, Germany
August Krankenhaus, Dusseldorf, Germany
OLV Ziekhenuis, Aalst, Belgium
Stanford University, Stanford, California, United States
St. Boniface General Hospital, Winnipeg, Manitoba, Canada
Abrazo Arizona Heart Hospital, Phoenix, Arizona, United States
St. Luke's Episcopal Hospital, Houston, Texas, United States
Christie Clinical Vein and Vascular Center, Champaign, Illinois, United States
Imelda Ziekenhuis, Bonheiden, Belgium
Ospedale San Raffaele, Milan, Italy
UniversitĂ La Sapienza/Policlinico Umberto I, Roma, Italy
Cardiovascular Center Frankfurt-Sankt Katherinen, Frankfurt, Germany
St Franziskus Hospital Munster, MĂĽnster, Germany
Klinikum Dortmund GmbH, Dortmund, Germany
Community Care Physicians, Latham, New York, United States
Pontificia Universidad Catolica de Chile, Santiago, Chile
Pontificia Universidad Caolica de Chile, Santiago, Chile