1. Department of Otolaryngology , The Second Affiliated Hospital; Shandong University; Shandong China
2. Key Research Laboratory of Otolaryngology , National Health and Family Planning Commission of China; Shandong University; Shandong China
3. Department of Otolaryngology , National University of Singapore; National University Health System; Singapore
4. Department of Otolaryngology; The First Affiliated Medical Hospital of Sun Yat-Sen University; Guangzhou China
5. Department of Pathology , National University of Singapore; National University Health System; Singapore