title: L.C. Coates and P.S. Helliwell reply.
authors: UK National Institute for Health Research Clinical Lecturer, University of Leeds;
authors: Laura C
authors: LC
authors: Coates
authors: Senior Lecturer in Rheumatology, University of Leeds, Leeds, UK. p.helliwell@leeds.ac.uk.
authors: Philip S
authors: PS
authors: Helliwell