1. Department of Surgery, Kurume University Hospital, Kurume, Fukuoka 830-0011, Japan
2. Department of Pathology, Kurume University School of Medicine, Kurume, Fukuoka 830-0011, Japan
3. Department of Diagnostic Pathology, Kurume University Hospital, Kurume, Fukuoka 830-0011, Japan
4. Department of Surgery, Tagawa Hospital, Tagawa, Fukuoka 826-8585, Japan