The Christ Hospital and Lindner Research Center, Cincinnati, OH. Electronic address: Lindner@thechristhospital.com. Royal Brompton Hospital, London, United Kingdom. Clinical Trials Center, Cardiovascular Research Foundation, New York, NY; New York-Presbyterian Hospital/Columbia University Medical Center, New York, NY. Shockwave Medical, Santa Clara, CA. Clinical Trials Center, Cardiovascular Research Foundation, New York, NY; New York-Presbyterian Hospital/Columbia University Medical Center, New York, NY; The Zena and Michael A. Wiener Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York, NY.