RT Journal Article SR Electronic T1 Evidence evolves over time and should be based on data not opinion JF BMJ Evidence-Based Medicine JO BMJ EBM FD BMJ Publishing Group Ltd SP 191 OP 192 DO 10.1136/bmjebm-2019-111222 VO 25 IS 6 A1 David Hawkes YR 2020 UL http://ebm.bmj.com/content/25/6/191.abstract AB