Funding for this research was provided by:
National Natural Science Foundation of China (U1134202)
ORCID
Xue-song JIN: http://orcid.org/0000-0003-3033-758X
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Publication History
Received: 2016-11-22
Accepted: 2017-05-15
Crosschecked: 2017-07-07
Content Type
: Article
Copyright
: © Zhejiang University and Springer-Verlag Berlin Heidelberg 2017