1. Department of Oral and Maxillofacial Functional Rehabilitation, Graduate School of Medicine; University of the Ryukyus; Okinawa Japan
2. Department of Oral Surgery; Okinawa Red Cross Hospital; Okinawa Japan
3. Division of Research and Treatment for Oral and Maxillofacial Cogenital Anomalies, School of Dentistry; Aichi-gakuin University; Aichi Japan