About the Authors

Sarah Burkill

Roles Data curation, Formal analysis, Methodology, Project administration, Writing – original draft, Writing – review & editing

sarah.burkill@ki.se

Affiliations Centre for Pharmacoepidemiology, Karolinska Institutet, Stockholm, Sweden, Division of Clinical Epidemiology, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden

Pia Vattulainen

Roles Data curation, Formal analysis, Methodology, Writing – review & editing

Affiliation EPID research, Helsinki, Finland

Yvonne Geissbuehler

Roles Conceptualization, Resources, Writing – review & editing

Affiliation Novartis Pharma AG, Basel, Switzerland

Meritxell Sabido Espin

Roles Conceptualization, Resources, Writing – review & editing

Affiliation Merck group, Darmstadt, Germany

Catrinel Popescu

Roles Conceptualization, Resources, Writing – review & editing

Affiliation Biogen, Maidenhead, United Kingdom

Kiliana Suzart-Woischnik

Roles Conceptualization, Resources, Writing – review & editing

Affiliation Bayer AG, Berlin, Germany

Jan Hillert

Roles Conceptualization, Resources, Writing – review & editing

Affiliation Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden

Miia Artama

Roles Conceptualization, Resources, Writing – review & editing

Affiliation National Institute for Health and Welfare, Helsinki, Finland

Auli Verkkoniemi-Ahola

Roles Conceptualization, Resources, Writing – review & editing

Affiliation Department of Neurology, Helsinki University, Helsinki, Finland

Kjell-Morten Myhr

Roles Conceptualization, Resources, Writing – review & editing

Affiliation Department of Clinical Medicine, University of Bergen, Bergen, Norway

Sven Cnattingius

Roles Conceptualization, Resources, Writing – review & editing

Affiliation Division of Clinical Epidemiology, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden

Pasi Korhonen

Roles Conceptualization, Resources, Writing – review & editing

Affiliation EPID research, Helsinki, Finland

Scott Montgomery

Roles Conceptualization, Resources, Supervision, Writing – review & editing

Affiliations Division of Clinical Epidemiology, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden, Clinical Epidemiology and Biostatistics School of Medical Sciences, Örebro University, Örebro, Sweden, Department of Epidemiology and Public Health, University College London, London, United Kingdom

Shahram Bahmanyar

Roles Conceptualization, Resources, Supervision, Writing – review & editing

Affiliations Centre for Pharmacoepidemiology, Karolinska Institutet, Stockholm, Sweden, Division of Clinical Epidemiology, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden

Competing Interests

I have read the journal's policy and the authors of this manuscript have the following competing interests: This study was funded by Bayer AG, Biogen Netherlands B.V., Merck KGaA, and Novartis Europharm Limited. SB reports no personal conflict of interest, but works for CPE which receives funding from third parties including pharmaceutical companies. PV reports no personal conflict of interest, but works for EPID Research which is a contract research organization and thus its employees have been and currently are working in collaboration with several pharmaceutical companies. YG is an employee of Novartis Pharma AG. MS is an employee of Merck KGaA. CP is an employee of Biogen. KSW is an employee of Bayer AG. JH has received honoraria for serving on advisory boards or steering committees for Biogen, Merck, Sanofi-Genzyme and Novartis and speaker’s fees from Biogen, Novartis, Merck-Serono, Bayer-Schering, Teva and Sanofi-Genzyme. He has served as P.I. for projects, or received unrestricted research support from, BiogenIdec, Merck-Serono, TEVA, Sanofi-Genzyme and Bayer-Schering. MA reports no conflict of interest. AM reports no conflict of interest. KMM has received unrestricted research grants to his institution and/or scientific advisory board or speakers honoraria from Almirall, Biogen, Genzyme, Merck, Novartis, Roche and Teva; and has participated in clinical trials organized by Biogen, Merck, Novartis, and Roche. PK works for EPID Research which is a contract research organization and thus its employees have been and currently are working in collaboration with several pharmaceutical companies. SM has received funding from AstraZeneca, and funding for MS related research from F. Hoffman-La Roche AG, and Novartis International AG. ShB reports no personal conflict of interest, but works for CPE which receives funding from third parties including pharmaceutical companies. There are no patents, products in development or marketed products to declare. This does not alter our adherence to all the PLOS ONE policies on sharing data and materials.