Zhang, Xiaohui
Lou, Haifeng
Tang, Xuejuan
Chen, Xiaoli
Article History
Received: 28 December 2020
Accepted: 16 March 2021
First Online: 21 April 2021
Declarations
:
: We only used secondary data from routine datasets, and all information remained confidential. The study has been granted an exemption from requiring informed consent. We confirmed that both the study and exempted informed consent were approved by the Ethics Review Board of the Women’s Hospital, School of Medicine, Zhejiang University (Title: Birth policy adjustment and associations with pregnancy outcomes; Ethics approval number, 2017–0012). Additionally, we confirmed that all methods used herein were performed in accordance with appropriate guidelines and regulations.
: This was not applicable as no individual personal data were made available.
: The authors demonstrated no conflicts of interest.