Hu, Shengquan
Sun, Wuji
Wang, Yeming
Yan, Hong
Funding for this research was provided by:
Natural Science Foundation of Beijing Municipality (KZ201510005007)
Article History
Received: 30 November 2018
Accepted: 24 January 2019
First Online: 4 February 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.