1. Deeks JJ, Dinnes J, D'Amico R, Sowden AJ, Sakarovitch C, Song F, et al. Evaluating non-randomised intervention studies. Health Technol Assess. 2003;7(iii-x):1–173.
2. Jenkins M. Evaluation of methodological search filters: a review. Health Inf Libr J. 2004;21:148–63.
3. Lefebvre C, Manheimer E, Glanville J. Searching for studies. In: Higgins JPT, green S, editors. Cochrane handbook for systematic reviews of interventions: version 5.1.0. Cochrane collaboration; 2011.
http://handbook-5-1.cochrane.org/index.htm#chapter_6/6_searching_for_studies.htm
. Accessed 30 Jan 2018.
4. Health Information Research Unit. Hedges. 2013.
http://hiru.mcmaster.ca/hiru/HIRU_Hedges_home.aspx
. Accessed 11 July 2013.
5. Reeves BC, Deeks JJ, Higgins JPT, Wells GA. Including non-randomized studies. In: Higgins JPT, green S, editors. Cochrane handbook for systematic reviews of interventions: version 5.1.0. Cochrane collaboration; 2011.
http://handbook-5-1.cochrane.org/chapter_13/13_including_non_randomized_studies.htm
. Accessed 30 Jan 2018.