Liu, Zhenfeng
Liu, Daishun
Wang, Zhihua
Zou, Yugang
Wang, Haixia
Li, Xiao
Zheng, Deliang
Zhou, Guoqi
Funding for this research was provided by:
health of the family planning commission of Guizhou province (Gzwjki2016-1-019)
special fund project of science and technology cooperation of Guizhou province ([2015] 39)
Article History
Received: 12 May 2020
Accepted: 16 October 2021
First Online: 3 December 2021
Declarations
:
: Z. Liu, D. Liu, Z. Wang, Y. Zou, H. Wang, X. Li, D. Zheng and G. Zhou declare that they have no competing interests.
: For this article no studies with human participants or animals were performed by any of the authors. All studies cited were in accordance with the ethical standards indicated in each case. No ethical approval was required. Consent for publication: not applicable.