1. Department of Internal Medicine, The Second Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450014, P.R. China
2. Department of Otolaryngology Head and Neck Surgery, The Second Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450014, P.R. China
3. Department of Internal Medicine, Henan Cancer Hospital and Affiliated Cancer Hospital of Zhengzhou University, Zhengzhou, Henan 450008, P.R. China