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Worsley, Sally D; Oude Rengerink, Katrien; Irving, Elaine; Lejeune, Stephane; Mol, Koen; Collier, Sue; Groenwold, Rolf H H; Enters-Weijnen, Catherine; Egger, Matthias; Rhodes, Thomas; GetReal, Work Package 3 (2017). Challenges in pragmatic trials: selection and inclusion of usual care sites. Journal of clinical epidemiology, 88, pp. 14-20. Elsevier 10.1016/j.jclinepi.2017.05.003
