RT Journal Article SR Electronic T1 Allocating scarce cardiovascular support in a pandemic: ECMO in crisis standards of care JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP heartjnl-2021-319193 DO 10.1136/heartjnl-2021-319193 A1 Zaidi, Danish A1 Fedson, Savitri E A1 Kirkpatrick, James N YR 2022 UL http://heart.bmj.com/content/early/2022/01/04/heartjnl-2021-319193.abstract AB