RT Journal Article SR Electronic T1 The ‘double whammy’ of low prevalence in clinical risk prediction JF BMJ Evidence-Based Medicine JO BMJ EBM FD BMJ Publishing Group Ltd SP 191 OP 194 DO 10.1136/bmjebm-2021-111683 VO 27 IS 4 A1 Thomas R Fanshawe A1 Seena Fazel YR 2022 UL http://ebm.bmj.com/content/27/4/191.abstract AB