1. Department of Anatomic Pathology; Graduate School of Medical Science, Kyushu University; Fukuoka Japan
2. Department of Pathology; National Kyushu Cancer Center; Fukuoka Japan
3. Department of Orthopedics; National Kyushu Cancer Center; Fukuoka Japan
4. Department of Orthopedic Surgery; Graduate School of Medical Science, Kyushu University; Fukuoka Japan.