1. Department of Oral and Maxillofacial Surgery, Seichokai Hannan Municipal Hospital
2. Department of Oral and Maxillofacial Surgery, Toyonaka Municipal Hospital
3. Department of Oral and Maxillofacial Surgery, Nishinomiya Municipal Central Hospital
4. Department of Oral and Maxillofacial Surgery Ⅱ, Osaka University Graduate School of Dentistry