The role of genetic polymorphisms regulating vitamin D levels in rheumatoid arthritis outcome: a Mendelian randomisation approach. Issue 7 (20th March 2014) - Viatte, Sebastien; Yarwood, Annie; McAllister, Kate; Al-Mudhaffer, Shibeb; Fu, Bo; Flynn, Edward; Symmons, Deborah P M; Young, Adam; Barton, Anne