1. Department of Radiology, Okinawa Red Cross Hospital, Naha, Japan.
2. Department of Radiology, Graduate School of Medicine, University of the Ryukyus, Nishihara, Japan.
3. Department of Hematology, Okinawa Red Cross Hospital, Naha, Japan.
4. Department of Surgery, Yuuai Medical Center, Tomigusuku, Japan.
5. Department of Pathology, Yuuai Medical Center, Tomigusuku, Japan.
6. Department of Neurosurgery, Nanbu Tokushukai Hospital, Yaese, Japan.
7. Department of Surgery, Okinawa Red Cross Hospital, Naha, Japan.