LAUSR

1. Bramer WM, Rethlefsen ML, Kleijnen J, Franco OH. Optimal database combinations for literature searches in systematic reviews: A prospective exploratory study. Syst Rev 2017;6:245. 2. Citrome L. Beyond PubMed: Searching the “grey literature” for clinical trial results. Innov Clin Neurosci 2014;11:42‐6. 3. Paez A. Gray literature: An important resource in systematic reviews. J Evid Based Med 2017;10:233‐40. 4. Benzies KM, Premji S, Hayden KA, Serrett K. State‐of‐the‐evidence reviews: Advantages and challenges of including grey literature. Worldviews Evid Based Nurs 2006;3:55‐61. 5. McAuley L, Pham B, Tugwell P, Moher D. Does the inclusion of grey literature influence estimates of intervention effectiveness reported in meta‐analyses? Lancet 2000;356:1228‐31. 6. Higgins J, Green S editors. Cochrane Handbook for Systematic Reviews of Interventions. 5.1.0 ed. Chichester, United Kingdom: The Cochrane Collaboration; 2011. 7. Adams J, Hillier‐Brown FC, Moore HJ, Lake AA, Araujo‐Soares V, White M, et al. Searching and synthesising ‘grey literature’ and ‘grey information’ in public health: Critical reflections on three case studies. Syst Rev 2016;5:164.