1. Department of Geriatrics and Special Services Medicine, Xinqiao Hospital, Army Military Medical University, Chongqing 400037, China
2. State Key Laboratory of Cattle Diseases Detection (Chongqing), Chongqing Customs Technology Center, Chongqing, 400020, P. R. China
3. Department of Health Management, Xinqiao Hospital, Army Military Medical University, Chongqing 400037, China