Funding for this research was provided by:
Project of Guangxi Health and Family Planning Commission (Z20180201)
Article History
Received: 13 April 2020
Accepted: 3 July 2020
First Online: 23 July 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study was approved by Ethical Committee of The Ailiated Hospital of Youjiang Medical University for Nationalities and conducted in accordance with the ethical standards.
: Yes.