Institution: | 1. Health Care Unit, Jining No.1 People's Hospital, Jining, China;2. Department of Respiratory Medicine, Affiliated Hospital of Jining Medical College, Jining, China;3. Department of Respiratory Medicine, Jining No.1 People's Hospital, Jining, China;4. Department of Cardiac Surgery, Jining No.1 People's Hospital, Jining, China |