Pragmatic evaluation of methods for retrieving unpublished information on comparator interventions in a systematic review of smoking cessation trials.
Neža JavornikDaniel J H PowellMaarten C EismaMarie JohnstonMarion K CampbellJamie Hartmann-BoyceSusan MichieRobert J WestNicola BlackMarijn de BruinPublished in: Psychology & health (2022)
Requesting authors for unpublished comparator intervention data, using specially-developed checklists and unpublished materials, substantially improves the quality of data available for systematic reviews.