Correspondence to: Kevin Croce, MD, PhD, Brigham and Women’s Hospital, Shapiro 5, 75 Francis St, Boston, MA 02115. Email

E-mail Address: [email protected]

https://orcid.org/0000-0002-8519-4726

CTO/Complex Coronary Intervention Program, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (B.B., K.C.).