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APA Citation
Crocker, J. C., Farrar, N., Cook, J. A., Treweek, S., Woolfall, K., Chant, A., Bostock, J., Locock, L., Rees, S., Olszowski, S., & Bulbulia, R. (2020). recruitment and retention of participants in UK surgical trials: survey of key issues reported by trial staff. BJS open, 4(6), 1238–1245. http://access.bl.uk/ark:/81055/vdc_100115149026.0x000002