1. Department of Pulmonary and Critical Care Medicine, Peking University Shenzhen Hospital, Shenzhen Peking University-The Hong Kong University of Science and Technology Medical Center, Shenzhen, P.R. China
2. Department of Pulmonary and Critical Care Medicine, Peking University Shenzhen Hospital, Shenzhen, P.R. China
3. Department of Geriatrics, Peking University First Hospital, Beijing, P.R. China