1. Department of Respiratory Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036‑8562, Japan
2. Department of Vascular and Inflammatory Medicine, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036‑8562, Japan
3. Department of Otorhinolaryngology Head and Neck Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036‑8562, Japan