1. Division of Morphological Pathology, Department of Basic Laboratory Sciences, School of Health Sciences, Faculty of Medicine, University of the Ryukyus, 207 Uehara, Nishihara, Okinawa903-0215, Japan
2. Department of Internal Medicine, Iwashita Medical Clinic, Okinawa, 904-2214Japan
3. Department of Regenerative Medicine, Graduate School of Medicine, University of the Ryukyus, Okinawa, 903-0215Japan
4. Health Information Management Major, Management and Information Science Division, Faculty of International Studies, Meio University, Okinawa, 905-8585, Japan
5. Department of Oral and Maxillofacial Functional Rehabilitation, Graduate School of Medicine, University of the Ryukyus, Okinawa, 903-0215Japan
6. Department of Pathology, Fukuoka University Chikushi Hospital, Fukuoka, 818-0067Japan