Received: 2 July 2019
Accepted: 25 March 2020
First Online: 15 April 2020
Ethics approval and consent to participate
: The study protocol was approved by the Ethics Committee of the Medical University of Vienna (ethical approval number: 1694/2015). The methods were carried out in accordance with the relevant guidelines and regulations; all patients got informed before the surgical procedure and gave their written consent.
: Not applicable.
: The authors declare that they have no conflicts of interest.