1 Head and Neck Surgery Department, David Geffen School of Medicine at UCLA, 951794, 35-64 Rehab, 1000 Veteran Avenue, Los Angeles, CA, 90095, USA.
2 Neurology Department, David Geffen School of Medicine at UCLA, 3-250 RNRC, Los Angeles, CA, 90095, USA.
3 Otorhinolaryngology/Head and Neck Surgery Department, School of Medicine, Hamamatsu University, 1-20-1 Handayama, Hamamatsu, 431-3192, Shizuoka, Japan.
4 Head and Neck Surgery Department, David Geffen School of Medicine at UCLA, 951794, 35-64 Rehab, 1000 Veteran Avenue, Los Angeles, CA, 90095, USA. ishiyama@ucla.edu.