1. Department of Neuropsychiatry; University of Tsukuba; Tsukuba; Japan
2. Kodama Clinic; Tokyo; Japan
3. Department of Neuropsychiatry and Neuroscience; Ehime University; Toon; Japan
4. Department of Epidemiology; Institute of Community Medicine; University of Tsukuba; Tsukuba; Japan
5. Department of Biostatistics; Kurume University; Kurume; Japan
6. Department of Clinical Trial Design and Management; Translational Research Center; Kyoto University Hospital; Kyoto; Japan