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Funding for this research was provided by:
Special Public Welfare Industry Research of National Health and Family Planning Commission of China (201402010)
the applied basic research project of Shanxi province (201601D011086)
Shanxi provincial Health Planning Commission (2018GW04)
National Natural Science Foundation of China (81972452)
Key research and development project of Shanxi province (201803D31121)
Received: 9 April 2020
Accepted: 29 October 2020
First Online: 30 November 2020
Ethics approval and consent to participate
: The study was approved by the ethics committee of the Second Hospital, Shanxi Medical University and written informed consent was obtained from the participants. The study was performed in accordance with the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.