1. Department of Pulmonary and Critical Care Medicine Ward, Peking Union Medical College HospitalPeking Union Medical College and Chinese Academy of Medical Sciences Beijing China
2. Department of Health Care, Peking Union Medical College HospitalPeking Union Medical College and Chinese Academy of Medical Sciences Beijing China
3. Department of Medical ICU, Peking Union Medical College HospitalPeking Union Medical College and Chinese Academy of Medical Sciences Beijing China
4. Department of Nursing, Peking Union Medical College HospitalPeking Union Medical College and Chinese Academy of Medical Sciences Beijing China
5. School of NursingPeking Union Medical College Beijing China