1 Department of Sleep Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 7348533, Japan. kumaguy88@hiroshima-u.ac.jp.
2 Sleep Disorders Center, Hiroshima University Hospital, Hiroshima, Japan. kumaguy88@hiroshima-u.ac.jp.
3 Department of Sleep Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 7348533, Japan.
4 Department of General Dentistry, Kyushu University Hospital, Fukuoka, Japan.
5 Sleep Disorders Center, Hiroshima University Hospital, Hiroshima, Japan.