Funding for this research was provided by:
Received: 1 May 2018
Accepted: 4 September 2019
First Online: 10 October 2019
Ethics approval and consent to participate
: All experiments were approved by the local governmental ethic committee of Saarland (no: 44–11) and were performed in accordance to the UKCCCR guidelines for the welfare of animals in experimental neoplasia and the Interdisciplinary Principles and Guidelines for the use of animals in research.
: Not applicable.
: The authors declare that they have no competing interests.