Community Health Science Center, Saitama Medical University, Saitama, Japan;
Department of Dentistry and Oral Surgery, Tochigi National Hospital, Tochigi, Japan;
Department of Oral and Maxillofacial Surgery, Division of Medicine, Interdisciplinary Graduate School of Medicine and Engi- neering, Univer-sity of Yamanashi, Kofu and Tamaho, Japan;
Department of Oral and Maxillofacial Surgery, Dokkyo Medical University School of Medicine, Tochigi, Japan;
Department of Oral and Maxillofacial Surgery, Faculty of Medicine, Sai-tama Medical University, Saitama, Japan;
Department of Oral and Maxillofacial Surgery, Institute of Clinical Medicine, University of Tsukuba, Tsukuba, Japan;
Department of Oral and Maxillofacial Surgery, Jichi Medical University, Tochigi, Japan;
Department of Oral and Maxillofacial Surgery, Kanagawa Dental College, Yokosuka, Japan;
Department of Stomatology and Oral Surgery, Gunma University Graduate School of Medicine, Maebashi, Japan;
Division of Gereatric Dentistry, Niigata University Medical & Dental Hospital, Niigata, Japan;
Oral and Maxillofacial Surgery, Dry Mouth Clinic, The Nippon Dental University Niigata Hospital, Niigata, Japan;
Oral Diagnosis and Medicine, Department of Oral Pathobiological Science, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan;
Oral Surgery, Department of Oral Restitution, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan;
Section of Oral and Maxillofacial Oncology, Division of Maxillofacial Diagnostic and Surgical Sciences, Faculty of Dental Science, Kyushu University, Fukuoka, Japan;