1. Department of Otorhinolaryngology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, P.R. China
2. Department of Otorhinolaryngology, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, P.R. China
3. School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, Zhejiang, P.R. China