1. Department of Respiratory, The First Affiliated Hospital of Jinzhou Medical University, Jinzhou, Liaoning 121001, P.R. China
2. School of Public Health, Jilin University, Changchun, Jilin 130021, P.R. China
3. School of Pharmacy, Jiangxi University of Traditional Chinese Medicine, Nanchang, Jiangxi 330006, P.R. China