2021 ACC/AHA Key Data Elements and Definitions for Heart Failure: A Report of the American College of Cardiology/American Heart Association Task Force on Clinical Data Standards (Writing Committee to Develop Clinical Data Standards for Heart Failure) - Bozkurt, Biykem; Hershberger, Ray E; Butler, Javed; Grady, Kathleen L; Heidenreich, Paul A; Isler, Maria Lizza; Kirklin, James K; Weintraub, William S (Journal of the American College of Cardiology, 2021)