1. Department of Clinico-Diagnostic Pathology; Showa University Fujigaoka Hospital; Kanagawa Japan
2. Department of Clinico-Diagnostic Pathology; Showa University Koto-Toyosu Hospital; Tokyo Japan
3. Division of Pathology; Department of Oral Diagnostic Sciences, Showa University School of Dentistry; Tokyo Japan
4. Department of Pathology; Clinico-Diagnostic Pathology, Showa University School of Medicine; Tokyo Japan