1. Department of Otolaryngology; Head and Neck Surgery; Institute of Otolaryngology of PLA, Chinese PLA General Hospital; Beijing 100853 People's Republic of China
2. Department of Otolaryngeal-Head Neck Surgery; Beijing Tiantan Hospital, Capital Medical University; Beijing 100050 People's Republic of China
3. State Key Laboratory for Agro-biotechnology; China Agricultural University; Beijing 100083 People's Republic of China
4. Department of Communicative Disorders and Sciences; Center for Hearing and Deafness, the State University of New York at Buffalo; Buffalo New York USA