Recruitment, randomization and retention: UK experience of the '3 RS' in osteoarthritis drug trials targeting pain. (April 2018) - Masters, S.; Lovegrove, P.; Pereira, C.; Goff, M.; Lang, G.; Vincent, T.L.; Barker, K.; Arden, N.K.; Taylor, A.; Bottomley, N.; Jackson, W.; Price, A.; et al.