Gietzelt, Caroline http://orcid.org/0000-0002-9145-7385
von Goscinski, Corinna
Lemke, Julia
Schaub, Friederike
Hermann, Manuel M.
Dietlein, Thomas S.
Cursiefen, Claus
Heindl, Ludwig M.
Enders, Philip
Article History
Received: 12 August 2019
Revised: 3 December 2019
Accepted: 10 February 2020
First Online: 5 March 2020
Compliance with ethical standards
: According to regional medical regulations on retrospective single-centre clinical studies (§15 of the Professional code of conduct, General Medical Council for the Northern Rhine in accordance with the General Data Protection Regulation GDPR of the European Union), the Ethics Committee of the University of Cologne ruled that approval was not required for this retrospective analysis. Throughout the whole study, the 1964 Helsinki declaration and its later amendments as well as all applicable national regulations and laws were observed.
: The authors declare that they have no conflict of interest.