1. Department of Otolaryngology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, China Academy of Medicine Sciences, Beijing, P.R. China
2. School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, People’s Republic of China
3. Department of Anesthesia, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, China Academy of Medicine Sciences, P.R. China