1 Department of Otorhinolaryngology, Head and Neck Surgery, United Christian, Hospital and Tseung Kwan O Hospital, 2, Po Ning Lane, Tseung Kwan O, New Territories, Hong Kong. Electronic address: dr.zenon.yeung@gmail.com.
2 Department of Otorhinolaryngology, Head and Neck Surgery, The Chinese University of Hong Kong, Room 84026, 6/F, Lui Che Woo Clinical Sciences Building, Prince of Wales Hospital, Shatin New Territories, Hong Kong. Electronic address: jasonchan@ent.cuhk.edu.hk.