Article History
Received: 2 March 2018
Accepted: 27 April 2018
First Online: 2 May 2018
Compliance with ethical standards
:
: M. Lenschow, M. Bas, F. Johnson, M. Wirth and U. Strassen state no conflicts of interest regarding this manuscript.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments.
: All data were assessed from daily oto-rhino-laryngologic routine. Study data were assessed pseudonymised and published anonymised. Therefore, informed consent was not necessary (in accordance with the local institutional review board guidance).