1. Department of Oral and Maxillofacial Functional Rehabilitation, Graduate School of Medicine, University of The Ryukyus, Nishihara, Okinawa 903‑0215, Japan
2. Department of Oral and Maxillofacial Surgery, Okinawa Red Cross Hospital, Naha, Okinawa 902‑8588, Japan
3. Department of Plastic and Reconstructive Surgery, Graduate School of Medicine, University of the Ryukyus, Nishihara, Okinawa 903‑0215, Japan