1. Department of Anatomy and Embryology School of Medicine, Complutense University Madrid Spain
2. Department of Otorhinolaryngology Hospital Clínico San Carlos, Complutense University Madrid Spain
3. Division of Internal Medicine Jikou‐kai Clinic of Home Visits Sapporo Japan
4. Akita University School of Medicine Akita Japan
5. Department of Otolaryngology‐Head and Neck Surgery Tohoku University Graduate School of Medicine Sendai Japan