1. Department of Otolaryngology—Head and Neck Surgery, The First Affiliated Hospital of China Medical University, Shenyang, China;
2. Department of Otolaryngology, Head and Neck Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, China;
3. Department of Otolaryngology, The No 463rd Hospital of PLA, Shenyang, China;
4. Department of Otolaryngology—Head and Neck Surgery, The First Affiliated Hospital of DaLian Medical Universty, Dalian, China;
5. Department of Neurosurgery, Medical Faculty of the Friedrich Alexander University of Erlangen-Numberg (FAU), Erlangen, Germany;
6. Department of Otolaryngology—Head and Neck Surgery, General Hospital of PLA and the E.N.T Institute of PLA, Beijing, China