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.
Wieland, L Susan; Berman, Brian M; Altman, Douglas G; Barth, Jürgen; Bouter, Lex M; D'Adamo, Christopher R; Linde, Klaus; Moher, David; Mullins, C Daniel; Treweek, Shaun; Tunis, Sean; van der Windt, Danielle A; Zwarenstein, Merrick; Witt, Claudia (2017). Rating of included trials on the Efficacy–Effectiveness Spectrum: development of a new tool for systematic reviews. Journal of Clinical Epidemiology, 84:95-104.