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Authors
Zhang, Xi
Wang, Jian
Huang, Li-Su
Zhou, Xin
Little, Julian
Hesketh, Therese
Zhang, Yong-Jun
Sun, Kun
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Funding
Funding for this research was provided by:
Shanghai Municipal Population and Family Planning Commission (2016ZB0103)
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Article History
Received: 21 December 2020
Accepted: 23 April 2021
First Online: 7 June 2021
Compliance with ethical standards
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: This study is a hospital-based survey, and there are not any individual and human information. We only ask the numbers and characteristics of hospitals. The ethical approval is not applicable for this study.
: The authors declared that there is no conflict of interest.
: The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
