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Rheumatoid Arthritis

Predictive value of serum amyloid a levels for requirement of concomitant methotrexate in tocilizumab initiation: A post hoc analysis of the SURPRISE study

Masaru KatoDepartment of Rheumatology, Endocrinology and Nephrology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan; View further author information

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Yuko KanekoDivision of Rheumatology, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan; View further author information

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Yoshiya TanakaThe First Department of Internal Medicine, University of Occupational and Environmental Health, Kitakyushu, Japan; View further author information

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Masayuki InooDepartment of Internal Medicine, Utazu Hospital, Ehime, Japan; View further author information

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Hitomi Kobayashi-HaraokaDivision of Hematology and Rheumatology, Nihon University School of Medicine, Tokyo, Japan; View further author information

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Koichi AmanoDepartment of Rheumatology and Clinical Immunology, Saitama Medical Center, Saitama Medical University, Kawagoe, Japan; View further author information

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Masayuki MiyataDepartment of Internal Medicine, Fukushima Red Cross Hospital, Fukushima, Japan; View further author information

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Yohko MurakawaDepartment of Rheumatology, Shimane University Faculty of Medicine, Izumo, Japan; View further author information

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Hidekata YasuokaDivision of Rheumatology, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan; View further author information

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Shintaro HirataDepartment of Clinical Immunology and Rheumatology, Hiroshima University Hospital, Hiroshima, Japan; View further author information

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Hayato NagasawaDepartment of Rheumatology and Clinical Immunology, Saitama Medical Center, Saitama Medical University, Kawagoe, Japan; View further author information

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Eiichi TanakaInstitute of Rheumatology, Tokyo Women's Medical University, Tokyo, Japan; View further author information

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Nobuyuki MiyasakaGraduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan; View further author information

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Hisashi YamanakaInstitute of Rheumatology, Tokyo Women's Medical University, Tokyo, Japan; View further author information

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Kazuhiko YamamotoDepartment of Allergy and Rheumatology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan; View further author information

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Isao YokotaDepartment of Biostatistics, Graduate School of Medicine, Hokkaido University, Sapporo, JapanView further author information

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Tatsuya AtsumiDepartment of Rheumatology, Endocrinology and Nephrology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan; Correspondence[email protected]
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Tsutomu TakeuchiDivision of Rheumatology, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan; View further author information