Fig. 1.

PRISMA diagram of study inclusion process. * Not a study using qualitative methods to explore recruiter perspectives of recruiting patients to an RCT = 231, Study protocol = 5, Cluster RCT = 19, Conference proceedings = 108, Qualitative research was undertaken to explore the intervention, not recruitment = 27, Could not find after repeated attempts = 4, Accidental duplicate = 1, Not in English = 3, Review (not primary research) = 42