1. Clinical Medical College of Chengdu Medical College, Chengdu, Sichuan, China
2. Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Chengdu Medical College, Chengdu, Sichuan, China
3. Department of Otolaryngology - Head and Neck Surgery, The First Affiliated Hospital of Chengdu Medical College, Chengdu, Sichuan, China
4. Department of Geriatric Medicine, The First Affiliated Hospital of Chengdu Medical College, Chengdu, Sichuan, China