Tocilizumab-effective multicentric Castleman's disease with infiltration of eosinophil and IgG4-positive plasma cells: A case report by Yusuke Katsumata, MD, Jun Ikari, MD, Nozomi Tanaka, MD, Mitsuhiro Abe, MD, Kenji Tsushima, MD, Yoko Yonemori, MD, Koichiro Tatsumi, MD

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