Quality of life, sleep and rheumatoid arthritis (QUASAR): a protocol for a prospective UK mHealth study to investigate the relationship between sleep and quality of life in adults with rheumatoid arthritis - Druce, K; Cordingley, L; Short, V; Moore, S; Hellman, B; James, B; Lunt, M; Kyle, S; Dixon, W; McBeth, J (BMJ Open, 2018)