TNF and rheumatoid arthritis: 18 Lipsky Lipsky PE PE van der Heijde van der Heijde DM DM St Clair St Clair EW EW Furst Furst DE DE Breedveld Breedveld FC FC Kalden Kalden JR JR Anti-Tumor Necrosis Factor Trial in Rheumatoid Arthritis with Concomitant Therapy Study G, Infliximab and methotrexate in the treatment of rheumatoid arthritis.