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Article History

Received: 24 October 2019

Revised: 16 January 2020

Accepted: 20 January 2020

First Online: 1 February 2020

Compliance with ethical standards

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: CS, JG, PR and GW state that there is no conflict of interest. HCL reports grants and personal fees from Akcea, Alnylam, Biogen, CSL Behring, Grifols, Takeda outside the submitted work. PA reports grants, personal fees and non-financial support from Allergan, Biogen, Ipsen, Merz Pharmaceuticals, Merck, Novartis, and Roche, personal fees and non-financial support from Bayer Healthcare, an non-financial support from Sanofi-Aventis/Genzyme, outside the submitted work. MS received compensations from Bayer, Biogen, CSL Behring, Genzyme, Grifols, Merck, Miltenyi Biotec, Novartis, Roche, Teva within the last three years. GRF serves as an editorial board member of <i>Cortex, Neurological Research and Practice, NeuroImage: Clinical, Zeitschrift für Neuropsychologie,</i> and <i>DGNeurologie</i>; receives royalties from the publication of the books <i>Funktionelle MRT in Psychiatrie und Neurologie, Neurologische Differentialdiagnose, and SOP Neurologie</i>; received honoraria for speaking engagements from Bayer, Desitin, Ergo DKV, Forum für medizinische Fortbildung FomF GmbH, GSK, Medica Academy Messe Düsseldorf, Medicbrain Healthcare, Novartis, Pfizer, and Sportärztebund NRW.

: The study was approved by the local ethics committee. The study was carried out in accordance with the Declaration of Helsinki.