Liu, Ruru
Mi, Baibing
Zhao, Yaling
Dang, Shaonong
Yan, Hong
Funding for this research was provided by:
Shaanxi Health and Family Planning Commission (Sxwsjswzfcght2016-013)
National Key Research and Development Program of China (2017YFC0907200)
Article History
Received: 28 August 2020
Accepted: 8 June 2021
First Online: 21 June 2021
Competing interests
: The authors declare no competing interests.