Coronary Artery Bypass Surgery

• Sahlgrenska University Hospital — Gothenburg, Sweden
• University Hospital Linköping — Linköping, Sweden
• University Hospital Örebro — Örebro, Sweden
• University Hospital Umeå — Umeå, Sweden

• Aarhus University Hospital Skejby — Aarhus, Denmark

• University Hospital of Patras — Pátrai, Achaia, Greece

• Istituto di Ricovero e Cura per Anziani — Ancona, Italy
• Maastricht University Medical Center — Maastricht, Netherlands
• Hospital Reina Sofía — Córdoba, Andalusia, Spain
• Hospital San Joan de Deu — Esplugues de Llobregat, Catalonia, Spain

Not specified

• Universitätsklinik Innsbruck — Innsbruck, Austria
• Universitaetsklinikum Salzburg — Salzburg, Austria
• Universitaetsklnikum St. Pölten — Sankt Pölten, Austria
• Krankenhaus Hietzing — Vienna, Austria

Not specified

• North Estonia Medical Centre — Tallinn, Harju, Estonia
• Tartu University Hospital — Tartu, Estonia

• Department of Cardiac Surgery, Dr Antoni Jurasz Memorial University Hospital — Bydgoszcz, Kuyavian-Pomeranian Voivodeship, Poland

• The Cleveland Clinic — Cleveland, Ohio, United States