RT Journal Article SR Electronic T1 Understanding the anatomy of the mitral valve: attitudinal is unnecessary JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP heartjnl-2022-322236 DO 10.1136/heartjnl-2022-322236 A1 Rebecca T Hahn YR 2022 UL http://heart.bmj.com/content/early/2022/12/29/heartjnl-2022-322236.abstract AB