1. Medical Ward 20 Lianshui County People's Hospital Huai'an Jiangsu China
2. Tongji University School of Medicine Shanghai China
3. Department of Respiratory and Critical Care Medicine Huai'an Second People's Hospital and The Affiliated Huai'an Hospital of Xuzhou Medical University Huai'an Jiangsu China
4. Department of Respiratory Medicine Huai'an First People's Hospital, Nanjing Medical University Huai'an Jiangsu China
5. Department of Respiratory Medicine Affiliated Hospital of Xuzhou Medical University Xuzhou Jiangsu China