Methods to improve recruitment to randomised controlled trials: Cochrane systematic review and meta-analysis. Treweek S, Lockhart P, Cook JA. S Treweek, P Lockhart, M Pitkethly, JA Cook… - BMJ open, 2013 - bmjopen.bmj.com GSID: wv1Imndjet0J
Strategies for increasing recruitment to randomised controlled trials: systematic review. Caldwell PHY, Tan A, Craig JC. PHY Caldwell, S Hamilton, A Tan, JC Craig - PLoS medicine, 2010 - journals.plos.org GSID: ZvWqeNBs-VwJ
Barriers to participation in clinical trials of cancer: a meta-analysis and systematic review of patient-reported factors. [No authors listed] GSID: 9TVbdP9nYu0J