Received: 29 November 2019
Accepted: 26 May 2020
First Online: 1 June 2020
Change Date: 5 July 2021
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1007/s00405-021-06961-9
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The study was approved by the Ethics Committee of the Faculty of Medicine of the TU Dresden covering anonymized retrospective and pooled analyses. The study followed the Declaration of Helsinki.