Kaiser, P.
Loth, F.
Attal, R.
Kummann, M.
Schuster, P.
Riechelmann, F.
Schlumberger, M.
Article History
Received: 10 January 2019
Accepted: 19 June 2019
First Online: 2 July 2019
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: Institutional review board approval was granted by means of a general waiver for scientific studies with retrospective data analysis (Local research ethics committee, Medical University Innsbruck; 20th February 2009).