Affiliation: | 1. Department of Oral Surgery and Oral Medicine, Ibi General Hospital, Miwa 2547-4, Ibigawa-cho, 501-06, Ibi/Gifu, Japan 2. Department of Oral and Maxillofacial Surgery, Gifu University School of Medicine, 40 Tsukasa-machi, 500, Gifu, Japan 3. 2nd Department of Pathology, Gifu University School of Medicine, 40 Tsukasa-machi, 500, Gifu, Japan 4. Department of Hygiene and Epidemiology, University School of Medicine, 4012, Debrecen, Hungary
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