Funding for this research was provided by:
National Clinical Research Center for Geriatric Diseases of China (NCRCG-PLAGH-2017008)
Wu Jieping Medical Foundation (320.6750.18383)
Beijing Municipal Capital Specialized Clinical Application Research Program of Science and Technology Commission Foundation (Z161100000116054)
Article History
Received: 4 March 2019
Accepted: 25 June 2019
First Online: 13 August 2019
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: The study design was approved by the Clinical Ethics Committee of the Chinese PLA General Hospital.
: For this type of study, formal consent is not required.