1. Department of Internal Medicine, Asama General Hospital, Nagano, Japan
2. Department of Pathology, Shinshu University School of Medicine, Nagano, Japan
3. Department of Pathology, Komoro Kosei General Hospital, Nagano, Japan
4. Gene Analysis Center, Otsuka Assay Laboratories, Otsuka Life Science Initiative, Otsuka Pharmaceutical Co., Ltd., Tokushima, Japan