1. Department of Clinical Laboratory, National Institute of Mental Health, National Center of Neurology & Psychiatry, Tokyo, Japan
2. Department of Sleep-Wake Disorders, National Institute of Mental Health, National Center of Neurology & Psychiatry, Tokyo, Japan
3. Japan Somnology Center, Neuropsychiatric Research Institute, Tokyo, Japan
4. Department of Psychiatry, Tokyo Women’s Medical University, Tokyo, Japan
5. Department of Somnology, Tokyo Medical University, Tokyo, Japan