1. Department of General Practice, Hainan Affiliated Hospital of Hainan Medical University, Hainan General Hospital, Haikou, Hainan, 570311, China
2. Department of Pulmonary & Critical Care Medicine, Hainan Affiliated Hospital of Hainan Medical University, Hainan General Hospital, Haikou, Hainan, 570311, China
3. Meitai Health Center of Lingao County, Lingao, Hainan, 571824, China