Acknowledgments
We would like to thank C. Miyakoshi, MD, MSc, DPH, for advice on the
analysis method and reliability of the analysis results. We would like
to thank Drs. N. Miyashita, Y. Nagai, T. Hasegawa, and T. Hatakeyama for
their helpful discussions and comments on the manuscript.
Funding: None.
Conflict of Interest: None.