1Medicine for the Elderly, NHS Lothian, Western General Hospital, Edinburgh, UK
2Centre for Genomic and Experimental Medicine, MRC Institute of Genetics and Cancer, University of Edinburgh, Western General Hospital, Edinburgh, UK
3Rheumatic Diseases Unit, NHS Lothian, Western General Hospital, Edinburgh, UK
4School of Medicine, Keele University, Keele, UK
5Haywood Academic Rheumatology Centre, Midland Partnership NHS Trust, Haywood Hospital, Stoke-On-Trent, UK