1. Department of Somnology, Tokyo Medical University, Tokyo, Japan; Japan Somnology Center, Neuropsychiatric Research Institute
Tokyo, Japan; Yoyogi Sleep Disorder Center, TokyoJapan
2. Department of Neurology, Dokkyo Medical University
TochigiJapan
3. Department of Neuropsychiatry, Kurume University
FukuokaJapan
4. Hannan Hospital
OsakaJapan
5. Department of Neurology, Juntendo University
TokyoJapan
6. Department of Clinical Medicine (Biostatistics & Pharmaceutical Medicine), School of Pharmacy, Kitasato University TokyoJapan