Received: 26 November 2017
Accepted: 2 November 2018
First Online: 19 November 2018
Ethics approval and consent to participate
: According to Norwegian regulations no ethics approval was required for this case report.
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: T Holmøy has received speakers honoraria and research grants from Merck, Biogen, Genzyme, Novartis and Teva, and has served on advisory board for Genzyme, Merck and Biogen. The other authors declared no potential conflicts of interest.
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