Acknowledgements
This work was supported by grants from the Bundesministerium für Bildung und Forschung (BMBF) to M.O., J.S., T.T., M.B., and M.S., the Bayerische Forschungsstiftung (ForbiMed) to M.N. and D.H.B. and the Graduiertenakademie TU Dresden to A.T.
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/10.1080/10428194.2016.1233538.