1. Department of Nursing Medical School of Chinese PLA Beijing China
2. Department of Senior Citizens Welfare Beijing College of Social Administration Beijing China
3. Medical Research Center Beijing Chao‐Yang Hospital, Capital Medical University Beijing China
4. Department of Nursing Chinese PLA General Hospital Beijing China
5. Center for Molecular Genetics, Institute for Translational Medicine, College of Medicine Qingdao University Qingdao China
6. Department of Epidemiology and Statistics, Graduate School Chinese PLA General Hospital Beijing China