Clinical characteristics and severity classification in mixed connective tissue disease: a nationwide retrospective study.
Kubo S, Kanda Y, Kameda H, Kuwana M, Narazaki H, Fujii T, Fujio K, Muro Y, Akamatsu K, Ohmura K, Ogura T, Shirai Y, Tanabe Y, Nakashima R, Tsuchida Y, Nakayamada S, Hasegawa H, Hirata S, Fukaya S, Kato T, Yasuoka H, Yamashita Y, Kono M, Atsumi T, Tanaka Y
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