1. Department of Otolaryngology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China
2. Operating Room, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China
3. Endoscopy, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China
4. Emergency Surgery, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China