1. Department of Thoracic Medicine, Chest Hospital, Tianjin 300051, P.R. China
2. Logistics University of Chinese People's Armed Police Force, Tianjin 300309, P.R. China
3. Neurology Department, Pingjin Hospital, Tianjin 300162, P.R. China
4. Physical Examination Center, Pingjin Hospital, Tianjin 300162, P.R. China
5. Medical Research Department, Pingjin Hospital, Tianjin 300162, P.R. China
6. Department of Geriatric Medicine, Fourth People's Hospital of Shanghai Affiliated to Tongji University School of Medicine, Shanghai 200081, P.R. China
7. Department of Geriatric Medicine, Pingjin Hospital, Tianjin 300162, P.R. China