Article History
Received: 1 December 2017
Revised: 12 March 2018
Accepted: 16 April 2018
First Online: 4 May 2018
Compliance with ethical standards
:
: The authors have no financial relationships relevant to this article to disclose.
: The authors declare that they have no conflict of interest.
: Due to the retrospective, descriptive study design, no patient consent was obtained. The study was approved by the ethics committee of North-West-Switzerland (EKBB, number 2014/184).