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.