1. Department of Otorhinolaryngology, Guangzhou Red Cross Hospital, Jinan University, Guangzhou, Guangdong, P. R. China
2. Department of Otorhinolaryngology, The Twelfth People’s Hospital Affiliated to Guangzhou Medical University(Guangzhou Twelfth People’s Hospital, Guangzhou Otolarynology-Head and Neck Surgery Hospital), Guangzhou, Guangdong, P.R. China