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Acknowledgements

We thank all of the members who participate our study intervention. We also would like to thank all members

reviewed stillbirth cases in our region. The present study was supported by JSPS KAKENHI (Grant No. JP

15K08803)

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Author contributions

Conceptualization: S.K., K.T. Interpretation of the results: S.T., D.K., T.M. Formal analysis: S.K., S.T. Preparation

of original draft: S.K., K.T. Review and editing: S.T., D.K., T.M. Approval of the final version of this manuscript:

all authors.

Competing interests The authors declare no competing interests.

Additional information

Correspondence and requests for materials should be addressed to S.K.

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