1. Department of Gastroenterology and Rheumatology; Fukushima Medical University School of Medicine; Fukushima Japan
2. Department of Neuropsychiatry; Fukushima Medical University School of Medicine; Fukushima Japan
3. Department of Neuropsychiatry; The University of Tokyo Hospital; Tokyo Japan
4. Department of Psychiatry, Aizu Medical Center; Fukushima Medical University; Fukushima Japan