Ventricular Dysfunction, Left

• 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

• 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

Not specified

• Truway Health, Inc. — New York, United States

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

• University of Arizona College of Medicine - Phoenix Banner University Medicine Heart Institute — Phoenix, Arizona, United States
• Ronald Regan UCLA Medical Center — Los Angeles, California, United States
• University of California, San Francisco — San Francisco, California, United States
• Los Robles Hospital & Medical Center — Thousand Oaks, California, United States

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

• 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