The purpose of the study is to study how a person-centered structured team caretaking of young adults (16-23 years) with newly diagnosed rheumatoid arthritis (RA), spondartrit (SpA) and psoriasartrit (PsA) in routine clinical care affect and predict the patient's health and ability to manage their everyday lives. Also included in the project is a long-term follow-up (up to 50 years) where the investigators want to investigate factors predicting good general health, low disease activity, good physical function, and comorbidity.