RT Journal Article SR Electronic T1 Ethnicity, heart failure, atrial fibrillation and diabetes: collider bias JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP heartjnl-2018-314467 DO 10.1136/heartjnl-2018-314467 A1 Andrew Felix Burden A1 Nicholas Timpson YR 2019 UL http://heart.bmj.com/content/early/2019/02/06/heartjnl-2018-314467.abstract AB