1. Department of Otorhinolaryngology Graduate School of Medical Sciences Kyushu University Fukuoka Japan
2. Department of Neurosurgery Hamanomachi Hospital Fukuoka Japan
3. Department of Plastic surgery Graduate School of Medical Sciences Kyushu University Fukuoka Japan
4. Department of Neurosurgery Tulane Center for Clinical Neurosciences Tulane University School of Medicine New Orleans LA USA