1. Department of Geriatrics and General Medicine, the Second Affiliated Hospital of Jilin University, Changchun, Jilin 130041, China
2. Department of Respiratory Medicine, the Second Affiliated Hospital of Jilin University, Changchun, Jilin 130041, China
3. Department of Respiratory Medicine, the Second Affiliated Hospital of Jilin University, No. 218 Ziqiang Street, Nanguan District, Changchun, Jilin 130041, China