Division of Oral Pathology;
Department of Health Promotion;
Kyushu Dental University;
Kitakyushu;
Japan;
Department of Pathology;
Saitama Cancer Center;
Saitama;
Japan;
Department of Oral and Maxillofacial Reconstructive Surgery;
School of Dentistry;
Iwate Medical University;
Morioka;
Japan;
Division of Pathology;
Cancer Institute;
Japanese Foundation for Cancer Research;
Tokyo;
Japan;
Oral; Cavity; Neuroendocrine; Carcinoma; Squamous; Cell; Carcinoma; Combined; Tumor;