1. Department of Respiratory, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, China.
2. Department of Respiratory, Shandong Provincial Qianfoshan Hospital, School of Clinical and Basic Medical Sciences, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China.
3. Department of Respiratory and Intensive Care Unit, The First Affiliated Hospital of Shandong First Medical University and Shandong Provincial Qianfoshan Hospital, Shandong Institute of Respiratory Diseases, Jinan, China.
4. Department of Pulmonary and Critical Medicine, Qilu Hospital of Shandong University, Jinan, China.