Correspondence to: Ik-Kyung Jang, MD, PhD, Cardiology Division, Massachusetts General Hospital, Harvard Medical School, 55 Fruit Street, GRB 800, Boston, MA 02114. Email

E-mail Address: [email protected]

https://orcid.org/0000-0002-5796-3006

Cardiology Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA (M.A., A.N., L.M.S., I.M., I.-K.J.).

Division of Cardiology, Kyung Hee University Hospital, Seoul, South Korea (I.-K.J.).