1. Department of E.N.T., The First People's Hospital of Neijiang, Neijiang, Sichuan 641000, P.R. China
2. Department of Neurology, Chengdu University of Traditional Chinese Medicine, Chengdu, Sichuan 610000, P.R. China
3. Department of E.N.T., West China Hospital, Sichuan University, Chengdu, Sichuan 610000, P.R. China