1. Department of Geriatrics, Shanghai Institute of Geriatrics, Huadong Hospital, Fudan University, Shanghai 200040, P.R. China
2. Department of Pulmonary Medicine, Zhongshan Hospital, Fudan University, Shanghai 200030, P.R.�China
3. Pregnancy Research Centre, Department of Maternal‑Fetal Medicine, Royal Women's Hospital, Parkville, Victoria 3052, Australia
4. Department of Pulmonary Medicine, Zhongshan Hospital, Fudan University, Shanghai 200030, P.R. China
5. Department of Pulmonary Medicine, Huadong Hospital, Fudan University, Shanghai 200040, P.R. China
6. Department of Anesthesiology, Fudan University Shanghai Cancer Center, Shanghai 200032, P.R.�China