1. Department of Cardiovascular and Respiratory Medicine; Akita University Graduate School of Medicine; Akita Japan
2. Department of Cell Physiology; Akita University Graduate School of Medicine; Akita Japan
3. Department of Neuropsychiatry; Akita University Graduate School of Medicine; Akita Japan
4. Sleep & Circadian Neurobiology Laboratory; Stanford University School of Medicine; Palo Alto California USA
5. Saiseikai Nagasaki Hospital; Nagasaki Japan