1. Department of Respiratory Medicine, the First Affiliated Hospital of Hainan Medical University, Haikou 570100, China
2. Hainan Province Clinical Medical Center of Respiratory Disease, Haikou 579199, China
3. International School of Nursing, Hainan Medical University, Haikou 571199, China
4. Department of Respiratory and Critical Care Medicine, the First Affiliated Hospital of Harbin Medical University, Harbin 150081, China
5. Kang'an Hospital of Mudanjiang, Mudanjiang 157000, China