1. Vitamin D deficiency is common in patients with RA and linked to disease activity, but circulating levels are unaffected by TNFα blockade: results from a prospective cohort study. Issue 6 (3rd November 2010) Authors: Welsh, Paul; Peters, Mike J L; McInnes, Iain B; Lems, Willem F; Lips, Paul T; McKellar, Gayle; Knox, Susan; Michael Wallace, A; Dijkmans, Ben A C; Nurmohamed, Michael T; Sattar, Naveed Journal: Annals of the rheumatic diseases Issue: Volume 70:Issue 6(2011) Page Start: 1165 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗