Conducting clinical trials in heart failure during (and after) the COVID-19 pandemic: an Expert Consensus Position Paper from the Heart Failure Association (HFA) of the European Society of Cardiology (ESC) - Anker, Stefan D; Butler, Javed; Khan, Muhammad Shahzeb; Abraham, William T; Bauersachs, Johann; Bocchi, Edimar Alcides; Bozkurt, Biykem; Braunwald, Eugene; Chopra, Vijay K; Cleland, John G (European heart journal, 2020)