1. Second Department of Respiratory Medicine, The First People’s Hospital of Kunming, Kunming, Yunnan Province, China
2. Stem Cell Engineering Laboratory of Yunnan Province, Department of Clinical Research, Kunming General Hospital of Chengdu Military Command, Kunming, Yunnan Province, China
3. Department of Pathology, The First People’s Hospital of Kunming, Kunming, Yunnan Province, China