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Authors
Ogawa, Kohei https://orcid.org/0000-0003-0997-2845
Jwa, Seung Chik https://orcid.org/0000-0002-8815-5714
Morisaki, Naho https://orcid.org/0000-0001-6151-4513
Sago, Haruhiko https://orcid.org/0000-0001-9387-1849
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Article History
Received: 17 March 2021
Accepted: 14 August 2021
First Online: 26 August 2021
Declarations
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: All authors declare that they have no conflicts of interest associated with the publication of this research.
: The registry of the Japan Society of Obstetrics and Gynecology Perinatal Database was conducted in accordance with the guidelines of the Declaration of Helsinki and other nationally valid regulations. All participating hospitals posted that they were participating in this database and that all data would be included in the research unless noted by the physician as otherwise. The JSOG website posted a summary of all analytical studies, and each hospital notified the patients to contact their hospital if they did not want to be included. The protocol for this study was approved by the Institutional Review Board at the National Center for Child Health and Development on April 18, 2017 (No. 1448).
: Informed consent was obtained in the form of an opt-out on the web site.
