Funding for this research was provided by:
ELAN Fonds der Friedrich-Alexander Universität Erlangen-Nürnberg
Text and Data Mining valid from 2018-08-16
Received: 30 January 2018
Accepted: 6 August 2018
First Online: 16 August 2018
Ethics approval and consent to participate
: The retrospective analysis of tissue samples is covered by the general treatment consent and does not require an additional informed consent. The study protocol was approved by the ethical committee of the University of Erlangen-Nuremberg (Ref.-No. 45_12 Bc) and was conducted in accordance with the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.