1. Department of Respiratory, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Institute of Respiratory Diseases, Jinan, China
2. Department of Respiratory, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, China
3. Department of Respiratory Medicine, Shengli Oilfield Central Hospital, Dongying, China
4. Department of Allergy, Shandong Provincial Qianfoshan Hospital, The First Affiliated Hospital of Shandong First Medical University, Shandong Institute of Respiratory Diseases, Jinan, China