Maintenance work on the ZORA databases is scheduled for Wednesday 22 May 2019 from 20:00-22:00. During this period ZORA and JDB will not be available. Thank you for your understanding.
Bassler, Dirk; Mueller, Katharina F; Briel, Matthias; Kleijnen, Jos; Marusic, Ana; Wager, Elizabeth; Antes, Gerd; von Elm, Erik; Altman, Douglas G; Meerpohl, Joerg J (2016). Bias in dissemination of clinical research findings: structured OPEN framework of what, who and why, based on literature review and expert consensus. BMJ Open, 6(1):e010024.