Affiliation: | 1. Nosocomial Infection Control Office, China-Japan Friendship Hospital, Beijing, China;2. Center for Respiratory Diseases, Department of Pulmonary and Critical Care Medicine, China-Japan Friendship Hospital, Capital Medical University; National Clinical Research Center of Respiratory Diseases, Beijing, China;3. Surgical Intensive Care Unit, China-Japan Friendship Hospital, Beijing, China;4. Department of Clinical Laboratory, China-Japan Friendship Hospital, Beijing, China |