1. Department of Otolaryngology‐Head and Neck Surgery Kobe University Graduate School of Medicine Kobe Japan
2. Department of Otorhinolaryngology University of the Philippines Manila‐ Philippine General Hospital Manila Philippines
3. Division of Rehabilitation Medicine Kobe University Hospital Kobe Japan
4. Pennsylvania State University State College Pennsylvania USA
5. Department of Diagnostic Pathology Kobe University Graduate School of Medicine Kobe Japan
6. Morimoto E.N.T. Clinic Osaka Japan
7. Department of Otolaryngology Kindai University Hospital Osaka Japan