CTLA-4 CT60 polymorphism is not an independent genetic risk marker of rheumatoid arthritis in a Japanese population. Issue 3 (21st February 2008) - Tsukahara, S; Iwamoto, T; Ikari, K; Inoue, E; Tomatsu, T; Hara, M; Yamanaka, H; Kamatani, N; Momohara, S