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Contributors MO: acquisition of data, patient treatment, drafting the manuscript. SN: interpretation of data, patient treatment, revising the manuscript. CM-H: evaluation of images.
Competing interests Dr Obermann has received scientific support and/or honoraria from Biogen Idec, Novartis, Sanofi-Aventis, Pfizer and Teva. He received research grants from the German Ministry for Education and Research (BMBF).
Patient consent Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.