Ketterer, M. C. http://orcid.org/0000-0003-0391-6607
Lemus Moraga, L. A.
Beitinger, U.
Pfeiffer, J.
Knopf, A.
Becker, C.
Article History
Received: 5 January 2020
Accepted: 30 January 2020
First Online: 11 February 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee. This retrospective study took place in the department of Otorhinolaryngology, Head and Neck surgery at the University Medical Center Freiburg. This study was approved by the Hospital’s Ethics Committee according to the Declaration of Helsinki (Washington, 2002) (Ethics Committee approval number: 273/15) and registered on German Clinical Trials Register (ExternalRef removed).
: Additional informed consent was obtained from all individual participants for whom identifying information is included in this article.