Jefferson, Laura, Fairhurst, Caroline, Brealey, Stephen, Coleman, Elizabeth, Cook, Liz, Hewitt, Catherine, Keding, Ada, Northgraves, Matthew, Rangan, Amar, Tew, Garry A., Torgerson, David J., Dias, Joseph, "Remote or on-site visits were feasible for the initial setup meetings with hospitals in a multicenter surgical trial: an embedded randomized trial", Journal of Clinical Epidemiology, 2018