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Article History

Received: 22 September 2019

Accepted: 13 January 2020

First Online: 22 January 2020

Compliance with ethical standards

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: CZ has served on scientific advisory boards for Philips and Bayer Schering; serves as co-editor on the Advisory Board of Clinical Neuroradiology; has received speaker honoraria from Bayer-Schering and Philips and has received research support and investigator fees for clinical studies from Biogen Idec, Quintiles, MSD Sharp & Dome, Boehringer Ingelheim, Inventive Health Clinical UK Ltd., Advance Cor, Brainsgate, Pfizer, Bayer-Schering, Novartis, Roche, Servier, Penumbra, WCT GmbH, Syngis, SSS Internartional Clinical Research, PPD Germany GmbH, Worldwide Clinical Trials Ltd., Phenox, Covidien, Actelion, Medivation, Medtronic, Harrison Clinical Research, Concentric, Penumbra, Pharmtrace, Reverse Medical Corp., Premier Research Germany Ltd., Surpass Medical Ltd. and GlaxoSmithKline. JG and BM work as consultants for Brainlab (Brainlab AG, Munich). All named potential conflicts of interest are unrelated to this study.

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or National Research Committee (Ethics Committee Technical University Munich + Clinical Trial Registration Number: 3094/11) and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

: This article does not contain any studies with animals performed by any of the authors.

: Informed consent was obtained from all individual participants included in the study.