Xiao, Hua
Quan, Hu
Pan, Shuguang
Yin, Bin
Luo, Wei
Tang, Ming
Ouyang, Yongzhong
Tang, Wei
Funding for this research was provided by:
the 2017 Annual Research Project of Health and Family Planning Commission of Hunan Province to Hua Xiao
Article History
Received: 29 December 2017
Accepted: 28 June 2018
First Online: 12 July 2018
Competing Interests
: The authors declare no competing interests.