HLA-DRB1 analysis identified a genetically unique subset within rheumatoid arthritis and distinct genetic background of rheumatoid factor levels from anticyclic citrullinated peptide antibodies

Ryosuke Hiwa, Katsunori Ikari, Koichiro Ohmura, Shuichiro Nakabo, Keitaro Matsuo, Hiroh Saji, Kimiko Yurugi, Yasuo Miura, Taira Maekawa, Atsuo Taniguchi, Hisashi Yamanaka, Fumihiko Matsuda, Tsuneyo Mimori, Chikashi Terao