Funding for this research was provided by:
National Natural Science Foundation of China (71571189)
ORCID
Jiong FU: http://orcid.org/0000-0001-8298-141X
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Publication History
Received: 2016-12-20
Accepted: 2017-04-10
Crosschecked: 2017-09-30
Content Type
: Article
Copyright
: © Zhejiang University and Springer-Verlag GmbH Germany 2017