Cui, Yan
Sommerfeld, Martin
Funding for this research was provided by:
DFG (SO 204/38)
Article History
Received: 11 July 2016
Accepted: 9 July 2017
First Online: 22 July 2017
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: This study was funded by the Deutsche Forschungsgemeinschaft under contract No. SO 204/38-1 to 3.