1. Department of Otolaryngology-Head & Neck Surgery, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Hokkaido, Japan
2. Department of Otolaryngology-Head and Neck Surgery, Teine-Keijinkai Hospital, Teine-Ku, Sapporo, Hokkaido, Japan
3. Shiseido Life Quality Beauty Center, SHISEIDO CO, LTD., Tokyo, Japan