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Contributors Study concept and design: CW, OA and MPW. Acquisition and analysis of data: all. Drafting of manuscript: CW, MTW. Critical revision of the manuscript for important intellectual content: all.
Competing interests CW: consulting and/or research funding: Bayer, Biogen, Novartis, TEVA. HPH: received honoraria for consulting and speaking at symposia from Bayer, Biogen, Genzyme, Merck Serono, Novartis Pharma, Roche and Teva Sanofi-Aventis. JK: accepted speaker and consulting fees from Merck Serono, Biogen, TEVA, Genzyme, Roche and Novartis. OA: accepted speakers honoraria and research funding from Biogen. MPW: accepted speaker and consulting fees from Biogen, Novartis, Roche and Genzyme.
Patient consent All patients signed a written informed consent stating that data and imaging can be used for research and education, approved by the local institutional review board at VUmc.
Provenance and peer review Not commissioned; externally peer reviewed.