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Article History

Received: 19 July 2019

Accepted: 23 January 2020

First Online: 17 February 2020

Ethics approval and consent to participate

: Subjects have given their written informed consent.The study protocol has been approved by the ethics committee of Center for Maternal-Fetal, Neonatal and Reproductive Medicine, National Center for Child Health and Development (No 602), and each research institute’s committee on human research, as follows.Ethics committee of Showa University, Ethics committee of Nagoya City University, The Ethical committee of the Jikei University School of Medicine, Nagasaki University Hospital Clinical Research Ethics Committee, The ethical committee of Hyogo College of Medicine, Echics committee of Miyagi Children’s Hospital, Yokohama City University Certified Institutional Review Board, Ethics committee of Saitama Medical School, Ethics committee of Sapporo Medical University, Ethics committee of Iwate Medical University, The ethics committee of Toho University, Ethics committee of Tokyo Women’s Medical University Hospital, Ethics committee of the Fujita Health University, Ethics committee of Osaka Medical Center and Research Institute for Maternal and Child Health, Ethics committee of Kobe University Hospital, Ethics committee of Tokushima University, Ethics committee of Ehime University, Ethics committee of National Hospital Organization Kyushu Medical Center, Ethical committee of Chiba University Hospital, Ethics committee of Kumamoto University, and Ethics committee of Oita University.

: Not applicable.

: The authors have no conflicts of interest to declare.