An, Jun
Yang, Cui
Li, Zuming
Finn, Patricia W.
Perkins, David L.
Sun, Jun
Bai, Zhihui
Gao, Liping
Zhang, Michael
Ren, Difeng
Funding for this research was provided by:
Beijing Municipal Natural Science Foundation (6173033)
Beijing Municipal Commission of Education (KM20131141 7007, PXM2013_ 014209_07_ 000082)
Article History
Received: 23 April 2018
Revised: 30 October 2018
Accepted: 31 October 2018
First Online: 12 November 2018
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: This article does not contain any studies with human participants or animals performed by any of the authors.