1. Department of Oral and Maxillofacial Surgery; Yokohama City University Graduate School of Medicine; Kanazawa-ku Yokohama Japan
2. Department of Oral and Maxillofacial Surgery; Saiseikai Yokohamashi Nanbu Hospital; Konan-ku Yokohama Japan
3. Department of Oral and Maxillofacial Surgery/Orthodontics; Yokohama City University Medical Center; Minami-ku Yokohama Japan