1. Department of Otolaryngology-Head and Neck Surgery, Shandong Provincial ENT Hospital, Shandong University, Jinan, Shandong, China
2. Department of Diagnostic Ultrasound, Shandong Second Provincial General Hospital, Jinan, Shandong, China
3. Department of Radiology, Shandong Second Provincial General Hospital, Jinan, Shandong, China