Acknowledgments
The authors are grateful to the following staff members for their great
support in data collection: Yuri Asano, Mio Sano, Natsumi Tsuchiya,
Miyuki Takeuchi, Sana Ohno, Nozomi Kobayashi, Asami Nagatani, Hitomi
Yuasa, and Saori Ikeda, who are the members of the Recurrence Prevention
Committee, Japan Obstetric Compensation System for Cerebral Palsy,
Public Interest Incorporated Foundation Japan Council for Quality Health
Care.
Conflict of interest: We declare no competing interests.
Author contributions statement: JH, NM, TI, and TI conceived
the study. JH wrote the initial protocol, analyzed the data, and wrote
the first draft of the manuscript. All authors collected data and
analyzed cases of CP. JH, MN, TI, and EJ coordinated the study and JH,
MN, TI, and EJ produced the database. Statistical analyses were
performed by ST and NT. All authors contributed to writing the
manuscript. TI, SS, KI, ST, AN, KF, TM, ST, HS, MI and TI are the
guarantors for the study. All authors had full access to all of the data
in the study and take responsibility for the integrity of the data and
the accuracy of the data analysis. The lead author affirms that this
manuscript is an honest, accurate, and transparent account of the study
being reported; that no important aspects of the study have been
omitted; and that any discrepancies from the study as planned have been
explained.
Funding: None.
Details of ethics approval: Alll procedures performed in
studies involving human participants were in accordance with the ethical
standards of the institutional and/or national research committee and
with the 1964 Helsinki declaration and its later amendments or
comparable ethical standards. The study protocol was approved by the
Institutional Review Boards (IRBs) of the JOCSC (No.26-01, Aug. 5th
2014).
Data sharing: No additional data is available.