ACPA-negative RA consists of two genetically distinct subsets based on RF positivity in Japanese. by Chikashi Terao, Koichiro Ohmura, Katsunori Ikari, Yuta Kochi, Etsuko Maruya, Masaki Katayama, Kimiko Yurugi, Kota Shimada, Akira Murasawa, Shigeru Honjo, Kiyoshi Takasugi, Keitaro Matsuo, Kazuo Tajima, Akari Suzuki, Kazuhiko Yamamoto, Shigeki Momohara, Hisashi Yamanaka, Ryo Yamada, Hiroo Saji, Fumihiko Matsuda, Tsuneyo Mimori

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