Systematic Review and Meta-Analysis of the Efficacy and Safety of Existing TNF Blocking Agents in Treatment of Rheumatoid Arthritis Aaltonen, Kalle J. ; Virkki, Liisa M. ; Malmivaara, Antti ; Konttinen, Yrjö T. ; Nordström, Dan C. ; Blom, Marja Abstract Publication: PLoS ONE Pub Date: January 2012 DOI: 10.1371/journal.pone.0030275 Bibcode: 2012PLoSO...730275A