After the baseline visit, data will be collected for each patient prospectively every 6 months for up to 2 years. At each visit, effectiveness parameters, as well as the patients' QoL and treatment pattern will be documented.
This is an observational, prospective primary data collection study. The duration of observation is 2 years after study enrolment date. Disease and treatment history will be retrospectively reviewed from medical record at enrollment with no time limits for the key diagnosis of enrolment (plaque psoriasis, psoriatic arthritis, ankylosing spondylitis and non-radiographic axial spondyloarthropathy).