Ventricular Dysfunction, Left

• Cardiology Clinic, University Hospital of Patras — Pátrai, Achaia, Greece
• 1st Cardiology Clinic, National and Kapodistrian University of Athens — Athens, Attica, Greece
• Cardilogy Clinic, University of Crete — Heraklion, Greece
• 2nd Cardiology Clinic, University of Ioannina — Ioannina, Greece

• Tri-Service General Hospital, National Defense Medical Center — Taipei, Taiwan

• Keimyung University Dongsan Hospital — Daegu, South Korea
• Seoul National University Bundang Hospital — Seongnam-si, Gyeonggi-do, South Korea
• Ajou University Hospital — Suwon, Gyeonggi-do, South Korea
• Pusan National University Yangsan Hospital — Yangsan, Gyeongsangnam-do, South Korea

Not specified

• West German Heart and Vascular Centre Essen, University Hospital Essen — Essen, Germany

• Los Angeles, California, United States
• San Diego, California, United States
• Torrance, California, United States
• Westminster, California, United States

• University of Nebraska Medical Center — Omaha, Nebraska, United States

• CHU Amiens — Amiens, France

• Complejo Hospitalario Universitario de Canarias — San Cristóbal de La Laguna, S/C Tenerife, Spain

• University of Ottawa Heart Institute — Ottawa, Ontario, Canada