1. From the Department of Otolaryngology (Dr Shinohara), Nishi-Kobe Medical Center, Kobe
2. From the Department of Otolaryngology (Drs Yamashita and Tsuji), Kyoto University Hospital, Kyoto
3. From the Department of Radiology (Dr Sugimoto), Kobe University, Kobe
4. From the Department of Otolaryngology (Dr Omori), Fukushima Medical University, School of Medicine, Fukushima City, Japan.