1. Department of Pathology and Clinical Laboratories, Gunma Cancer Center Hospital, 617-1, Takabayashinishi-cho Ohta, 373-8550, Japan; Department of Anatomic and Diagnostic Pathology, Dokkyo University School of Medicine, Mibu, Japan
2. Department of Pathology and Genetics, Aichi Cancer Center Hospital, Nagoya, Japan
3. Department of Hematology, Maebashi Saiseikai Hospital, Maebashi, Japan
4. Yashiro Medical Clinic, Maebashi, Japan
5. Second Department of Pathology, Gunma University School of Medicine, Maebashi, Japan
6. Department of Pathology and Clinical Laboratories Maebashi Red Cross Hospital, Maebashi, Japan
7. Second Department of Pathology, Fukuoka University School of Medicine, Fukuoka, Japan
8. Department of Pathology and Clinical Laboratories, Gunma Cancer Center Hospital, Ohta, Japan
9. Department of Anatomic and Diagnostic Pathology, Dokkyo University School of Medicine, Mibu, Japan