1. Department of Ear, Nose and Throat, United Christian Hospital, Affiliated Unit of the Chinese University of Hong Kong, Kwun Tong, New Kowloon, Hong Kong
2. Department of Otolaryngology-Head and Neck Surgery, New York Presbyterian Hospital, Weill Cornell Medical College, New York, New York, United States
3. Department of Neurological Surgery, New York Presbyterian Hospital, Weill Cornell Medical College, New York, New York, United States
4. Department of Neurology and Neuroscience, New York Presbyterian Hospital, Weill Cornell Medical College, New York, New York, United States