RT Journal Article SR Electronic T1 Shining a new light on pericardial fluid JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1528 OP 1529 DO 10.1136/heartjnl-2021-319929 VO 107 IS 19 A1 Erin A Fender A1 Chad J Zack YR 2021 UL http://heart.bmj.com/content/107/19/1528.abstract AB