Chitinase-3-like protein 1 (YKL-40) is a biomarker of severity of joint involvement in psoriatic arthritis - Salomon, Joanna; Matusiak, Łukasz; Nowicka-Suszko, Danuta; Szepietowski, Jacek (Advances in Dermatology and Allergology/Postępy Dermatologii i Alergologii, 2018)