1. Division of Oral and Maxillofacial Biopathological Surgery Department of Medicine of Sensory and Motor Organs Faculty of Medicine Tottori University Yonago‐city Tottori Japan
2. Department of Oral and Maxillofacial Surgery Ikeda Municipal Hospital Ikeda‐city Osaka Japan
3. Department of Oral and Maxillofacial Surgery Matsue Red Cross Hospital Matsue‐city Shimane Japan