RT Journal Article SR Electronic T1 How to write an image challenge multiple choice question JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1762 OP 1763 DO 10.1136/heartjnl-2021-319175 VO 107 IS 21 A1 Krieger, Eric V YR 2021 UL http://heart.bmj.com/content/107/21/1762.abstract AB