OLVG, Amsterdam, Netherlands
Kantonsspital, St. Gallen, Switzerland
Ferraroto Hospital - Catania University, Catania, Italy
Clinica Mediterranea, Naples, Italy
Bristol Heart Institute, Bristol, United Kingdom
AMC, Amsterdam, Netherlands
Foundation Cardiovascular medicine, La Jolla, California, United States
Mount Sinai Hospital, New York, New York, United States
C. Spaulding, Paris, France