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YKL-40 is a serum biomarker reflecting the severity of cutaneous lesions in psoriatic arthritis


  • Conflict of interest: none.

Correspondence: Kiyofumi Yamanishi, M.D., Ph.D., Department of Dermatology, Hyogo College of Medicine, 1-1 Mukogawa-cho, Nishinomiya, Hyogo 663-8501, Japan. Email:

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