Funding for this research was provided by:
Opening Foundation of National Clinical Research Center for Geriatric Diseases (NCRCG-PLAGH-2018008, NCRCG-PLAGH-2018010)
Article History
Received: 25 December 2019
Accepted: 9 April 2020
First Online: 30 April 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The ethics committee of the Chinese PLA General Hospital approved this study, which complies with the current laws of China (Ethic number: S2018-102-01).
: Written informed consent was obtained from all individual participants included in the study.