1. Department of Otolaryngology-Head and Neck Surgery, University of California San Francisco, San Francisco, CA 94115, USA
2. School of Medicine, University of California San Francisco, San Francisco, CA 94143, USA
3. Department of Surgery, University of Nairobi, Nairobi 00100, Kenya
4. Department of Otorhinolaryngology, Head and Neck Surgery, The Chinese University of Hong Kong, Hong Kong SAR, China