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Authors
Xu, Jiayue
Zhang, Yuqin
Yao, Minghong
Wu, Gonghua
Duan, Zhanqi
Zhao, Xing
Zhang, Juying
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Article History
Received: 25 June 2020
Accepted: 16 September 2020
First Online: 26 September 2020
Compliance with ethical standards
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: The NHSS is a national survey organized by the National Health and Family Planning Commission of China. The 2013 and 2018 National Health Services Surveys were all legal surveys approved and kept a record by the National Statistical Bureau. Oral consent of participate was obtained before the household survey.
: The authors declare that they have no competing interests
: Not applicable.
