1 Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, 50-1 Yonsei-Ro, Seodaemun-G, Seoul, Republic of Korea. Electronic address: grhong@yuhs.ac.
2 Marcus Heart Valve Center, Structural and Valvular Center of Excellence, Piedmont Heart Institute, 95 Collier Road, Suite 2065, Atlanta, GA, 30309, USA. Electronic address: mvannan2560@gmail.com.
3 Division of Cardiology, Cardarelli Hospital, Via A. Cardarelli, 9, Naples 80131, Italy. Electronic address: ebossone@hotmail.com.