Funding for this research was provided by:
National Natural Science Foundation of China (61309020, 61521003)
ORCID
Hong-chao HU: http://orcid.org/0000-0002-9770-6610
Publication History
Received: 2016-07-08
Accepted: 2016-11-10
Crosschecked: 2017-11-24
Content Type
: Article
Copyright
: © Zhejiang University and Springer-Verlag GmbH Germany 2017