Immune and mathematical procedures in early diagnosis of psoriatic and seronegative rheumatoid arthritis Alesea Nistor1,2*, Eugeniu Russu1, Liliana Groppa1,2, Lia Chișlari1, Lucia Dutca1, Liudmila Gonța1 https://doi.org/10.52645/MJHS.2022.4.01 Improvement of early diagnosis of psoriatic arthritis based on clinical data, immunological and mathematical research methods.