Core Dataset data dictionary to specify the content, structure, and syntax of the collected. 

SNOMED: Systematised Nomenclature of Medicine Clinical Terms; Documented by: B: both; C: clinician-reported specific; P: patient-reported specific; Collection time: FV: first visit, FU: follow-up visit; RI: relapse incidence; ISO: International Organisation for Standardisation; ISCED: International Standard Classification of Education; MS: multiple sclerosis; MRI: magnetic resonance imaging; DMT: disease-modifying treatment; aHSCT: autologous haematopoietic stem cell transplantation.

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