Self-management of fatigue in rheumatoid arthritis: A randomised controlled trial of group cognitive-behavioural therapy - Hewlett, S; Ambler, N; Almeida, C; Cliss, A; Hammond, A; Kitchen, K; Knops, B; Pope, D; Spears, M; Swinkels, A; Pollock, J (Ann Rheum Dis, 2011)