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Article History

First Online: 9 October 2019

Compliance with ethical guidelines

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: A. Aschendorff received travelling expenses and financial support for research from Advanced Bionics, Stäfa, Switzerland; financial support for research and travelling expenses from Cochlear Ltd, Australia; financial support for research and travelling expenses from Med-El, Innsbruck, Austria; travelling expenses and financial support for research from Oticon, Copenhagen, Denmark. S. Arndt received travelling expenses from Advanced Bionics, Stäfa, Switzerland; financial support for research and travelling expenses from Cochlear Ltd, Australia; financial support for research and travelling expenses from Med-El, Innsbruck, Austria and travelling expenses from Oticon, Copenhagen, Denmark. R. Laszig received financial support for research and travelling expenses from Advanced Bionics, Stäfa, Switzerland; financial support for research, travelling expenses and consultancy fees from Cochlear Ltd, Australia; travelling expenses from Oticon, Copenhagen, Denmark; financial support for research from Med-El, Innsbruck, Austria; financial support for research and travelling expenses from ARRIAG Munich, Germany; travelling expenses from Otologics Boulder, USA; travelling expenses from SonovaHolding, Stäfa, Switzerland; travelling expenses from the General Secretary of the German ENT Society; contract fees, consultancy fees and travelling costs from Medupdate and fees from Springer Medicine EiC. R. Beck received travelling expenses from Cochlear Ltd, Australia. This study was not sponsored by industry. M.C. Ketterer, C. Becker, T. Hildenbrand, F. Hassepass, T. Wesarg, A. Alballaa and I. Speck declare that they have no competing interests.

: Retrospective study; compliance with ethical standards is given and the authors have no funding, financial relationships or conflicts of interest to declare.

: The supplement containing this article is not sponsored by industry.