Developing a patient and public involvement intervention to enhance recruitment and retention in surgical trials (PIRRIST): study protocol (Trials, 2015)

(untitled) - Rees, S; Crocker, J; Locock, L; Petit-Zeman, S; Chant, A; Treweek, S; Cook, J; Farrar, N; Woolfall, K; Bulbulia, R