1 Department of Advanced Oral Surgery, Kanagawa Dental University, Yokohama Clinic, Kanagawa, Japan. Electronic address: ishii.shigeru@kdu.ac.jp.
2 Local incorporated administrative agency, Tokyo Metropolitan Hospital Organization, Tokyo Metropolitan Ebara Hospital, Department of Dentistry & Oral surgery, Tokyo, Japan.
3 Department of Oral and Maxillofacial Surgery, Showa University School of Dentistry, Tokyo, Japan.
4 Department of Advanced Oral Surgery, Kanagawa Dental University, Yokohama Clinic, Kanagawa, Japan.