TNF and rheumatoid arthritis: Lipsky PE, van der Heijde DM, St Clair EW, Furst DE, Breedveld FC, Kalden JR, et al. Anti-Tumor Necrosis Factor Trial in Rheumatoid Arthritis with Concomitant Therapy Study G, Infliximab and methotrexate in the treatment of rheumatoid arthritis.