1. Department of Traditional Chinese Medicine, Qilu Hospital of Shandong University, Jinan, Shandong 250012, P.R. China
2. Department of Respiratory Medicine, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, Shandong 264100, P.R. China
3. Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, P.R. China