Smolen JS.Kalden JR.Scott DL Effects and safety of leflunomide compared with placebo and sulphasalazine in active rheumatoid arthritis:a double blind,randomized,multicentre trial 1999(9149是什么意思_Smolen JS.Kalden JR.Scott DL Effects and safety of leflunomide compared with placebo and sulphasalazine in active rheumatoid arthritis:a double blind,randomized,multicentre trial 1999(9149在线翻译_英语_读音_用法_例句