1. Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, P. R. China;
2. School of Pharmacy, North Sichuan Medical College, Nanchong, Sichuan, P. R. China;
3. Department of Thoracic Surgery, The Seventh People’s Hospital of Chengdu, Chengdu, Sichuan, P. R. China