A comparison of etanercept and methotrexate in patients with early rheumatoid arthritis. - Bathon JM; Martin RW; Fleischmann RM; Tesser JR; Schiff MH; Keystone EC; Genovese MC; Wasko MC; Moreland LW; Weaver AL; Markenson J; Finck BK (New England Journal of Medicine, 2000)