Ifesemen, Onosi, McWilliams, Daniel F., Ferguson, Eamonn, Wakefield, Richard, Akin-Akinyosoye, Kehinde, Wilson, Deborah, Platts, Dorothy, Ledbury, Susan, Walsh, David A., "Central Aspects of Pain in Rheumatoid Arthritis (CAP-RA): protocol for a prospective observational study", BMC Rheumatology, 2021