TY - JOUR AN - 6 AU - Choi,HK. TI - Methotrexate and mortality in patients with rheumatoid arthritis: a prospective study. JO - Lancet PY - 2002 VL - 359 SP - 1173-1177 M2 - 1173 DO - 10.1016/S0140-6736(02)08213-2 ER -