1. Department of Respiratory and Critical Care, Anhui Geriatric Institute, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, P.R.�China
2. Menzies Institute for Medical Research, University of Tasmania, Hobart, TAS 7000, Australia
3. State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology, Macau 999078, SAR, P.R.�China