1. Intensive Care Unit, Inner Mongolia People's Hospital Hohhot Inner Mongolia Autonomous Region China
2. Center of Tumor, Inner Mongolia People's Hospital Hohhot Inner Mongolia Autonomous Region China
3. Department of Respiratory Medicine, Nanjing First Hospital Nanjing Medical University Nanjing China
4. Baotou medical college Baotou Inner Mongolia Autonomous Region China
5. Department of Respiratory and Critical Medicine Jinling Hospital Nanjing China