Zhai, Jiemei
Zhang, Heyu
Zhang, Jianyun
Zhang, Ran
Hong, Yingying
Qu, Jiafei
Chen, Feng
Li, Tiejun
Funding for this research was provided by:
National Natural Science Foundation of China (81671006)
National Natural Science Foundation of China (81300894)
National Natural Science Foundation of China (81671006)
Natural Science Foundation of Beijing Municipality (7172238)
the National Natural Science Foundation of China
Article History
Received: 10 February 2018
Revised: 14 August 2018
Accepted: 16 August 2018
First Online: 5 January 2019
Competing interests
: The authors declare no competing interests.