Author Contributions
Mizuho Nagao and Takao Fujisawa conceived the study. Kana Hamada, Mizuho Nagao, Ryo Imakiire, Kanae Furuya, Yumi Mizuno, Mayumi Matsunaga, Shingo Yamada, Kazutaka Nogami, Miyuki Hoshi, Taiga Kobori and Keigo Kainuma recruited the subjects and contributed to data collection. Kana Hamada, Takao Fujisawa and Mizuho Nagao conducted the analyses of the data. Yasunori Sato supervised the statistical analyses. Kana Hamada and Takao Fujisawa wrote the manuscript. Kazumoto Iijima made critical comments on the study design and manuscript. All the listed authors were involved in the review of the manuscript and approved the final content.