Bartling, Babett
Hofmann, Hans-Stefan
Article History
Received: 17 October 2017
Revised: 15 January 2018
Accepted: 31 January 2018
First Online: 22 February 2018
Compliance with ethical guidelines
:
: B. Bartling and H.-S. Hofmann declare that they have no competing interests.
: The use of patient material was approved by the local ethics committee, and informed consent of the patients was obtained.