1. Department of Otolaryngology, Aichi Medical University; Nagakute Aichi Japan
2. Department of Otolaryngology, Tono Kosei Hospital; Mizunami Gifu Japan
3. Public Health Center, Okazaki City Medical Association; Okazaki Aichi Japan
4. Department of Otolaryngology, Aichi Gakuin University; Aichi Japan
5. Department of Oral and Maxillofacial University, Matsumoto Dental University; Shiojiri Nagano Japan
6. Department of Cardiology, Nagoya University; Tsurumai Nagoya Japan