RT Journal Article SR Electronic T1 DOACs and risk of major bleeding with concomitant medicines JF Drug and Therapeutics Bulletin JO Drug Ther Bull FD BMJ Publishing Group Ltd SP 136 OP 136 DO 10.1136/dtb.2017.12.0559 VO 55 IS 12 YR 2017 UL http://dtb.bmj.com/content/55/12/136.1.abstract AB