Funding for this research was provided by:
National Natural Science Foundation of China (51175058)
ORCID
Chao GUO: http://orcid.org/0000-0003-2610-9613
Publication History
Received: 2016-05-24
Accepted: 2017-01-23
Crosschecked: 2017-11-20
Content Type
: Article
Copyright
: © Zhejiang University and Springer-Verlag GmbH Germany 2017