Potential conflict of interest
Disclosure forms provided by the authors are available with the full text of this article online at http://dx.doi.org/10.1080/10428194.2016.1207765.
Funding
This work was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) for the Cluster of Excellence REBIRTH (From Regenerative Biology to Reconstructive Therapy) [EXC 62/3] and the Deutsche Krebshilfe [MDS Verbund 110299 and Verbund 109714].