[1] Quantify Res, Stockholm, Sweden
[2] Univ Southampton, MRC Lifecourse Epidemiol Unit, Southampton, Hants, England
[3] Univ East Anglia, Sch Med, Norwich, Norfolk, England
[4] Univ Hosp Bristol, Bristol BS2 8HW, Avon, England
[5] Univ Hosp Birmingham, Endocrinol, Birmingham, W Midlands, England
[6] Univ East Anglia, Sch Med Hlth Policy & Practice, Norwich, Norfolk, England
[7] Univ Bristol, Bristol Med Sch, Bristol, Avon, England
[8] Univ Bristol, Bristol, Avon, England
[9] Univ Manchester, Manchester, Lancs, England
[10] Norfolk & Norwich Univ Hosp, Dept Rheumatol, Norwich, Norfolk, England
[11] York Univ, York Trials Unit, York, N Yorkshire, England
[12] Univ Sheffield, Sheffield, S Yorkshire, England