. 2022 Aug 5;32(8):363–369. doi: 10.2188/jea.JE20200529
© 2021 Takashi Oshio.
This is an open access article distributed under the terms of Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Figure 1. Structure of the sample used in this study.
