1. Department of Plastic and Reconstructive Surgery, Tottori University Hospital, Yonago 683-8504, Japan
2. Department of Social Medicine, School of Medicine, Faculty of Medicine, Tottori University, Yonago 683-8503, Japan
3. Division of Otolaryngology, Head and Neck Surgery, Department of Sensory and Motor Organs, School of Medicine, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan and
4. Division of Oral and Maxillofacial Surgery, Department of Sensory and Motor Organs, School of Medicine, Faculty of Medicine, Tottori University, Yonago 683-8504, Japan