Funding for this research was provided by:
the National Basic Research Program (973) of China (2012CB316400)
ORCID
Hou-kui ZHOU: http://orcid.org/0000-0001-7915-8684
Publication History
Received: 2016-04-01
Accepted: 2016-06-30
Crosschecked: 2017-09-22
Content Type
: Article
Copyright
: © Zhejiang University and Springer-Verlag GmbH Germany 2017