RT Journal Article SR Electronic T1 Peculiar QRS morphology: an electrophysiological phenomenon JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 953 OP 1020 DO 10.1136/heartjnl-2020-318499 VO 107 IS 12 A1 Chee Loong Chow A1 Om Narayan A1 Han Sung Lim YR 2021 UL http://heart.bmj.com/content/107/12/953.abstract AB