Modified design of stimulation of the left ventricular endocardium for cardiac resynchronization therapy in nonresponders, previously untreatable and high-risk upgrade patients (SOLVE-CRT) trial. - Singh JP; Walsh MN; Kubo SH; Auricchio A; Delnoy PP; Gold MR; Sanders P; Lindenfeld J; Rinaldi CA; Ullery S (American heart journal, 2021)