Guo, Tian
Liu, Tianyang
Sun, Yun
Liu, Xianna
Xiong, Rongguo
Li, He
Li, Zhitao
Zhang, Zhiguo
Tian, Zhen http://orcid.org/0000-0001-9044-637X
Tian, Ye
Funding for this research was provided by:
Department of Education, Heilongjiang Province (12521272)
Health and Family Planning Commission of Heilongjiang Province (2010-164)
National Science Foundation of China | National Natural Science Foundation of China-Yunnan Joint Fund (81727809, 81530052)
Article History
Received: 8 January 2019
Revised: 27 May 2019
Accepted: 28 May 2019
First Online: 11 June 2019
Conflict of interest
: The authors declare that they have no conflict of interest.