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During the first year, data related to demographics, lifestyle, clinical examinations will be collected at baseline, at 6 months (optional) and at 12 months. PROs, cognitive and motor assessments will be performed using the Healios+Me smartphone app. Additionally, participants will be asked to provide biological samples (i.e., blood, cerebrospinal fluid and stool, saliva and hair) and imaging data (if performed as per standard of care). One unscheduled visit may be performed in case the participant comes to the hospital with the occurrence of flare or for a treatment change. A long-term follow-up (FU, starting from month 12 and up to 4 years after month 12) is foreseen in this study. During the long-term FU medical data are collected either every 6 month or on a yearly basis, and PROs are collected every 6 months. Whether study visits are conducted in 6- or 12-monthly intervals depends on the schedule of the study visits for the Swiss MS cohort (SMSC).