Yuan, Jin-Qiu
Lv, Yue-Bin
Kraus, Virginia Byers
Gao, Xiang
Yin, Zhao-Xue
Chen, Hua-Shuai
Luo, Jie-Si
Zeng, Yi
Mao, Chen
Shi, Xiao-Ming
Funding for this research was provided by:
the U.S. National Institute of Aging / United Nations Fund for Population Activities (2P01AG031719)
Claude D. Pepper Older Americans Independence Centers grant (5P30 AG028716)
National Natural Sciences Foundation of China (71233001, 71490732 and 81573247)
Article History
Received: 26 May 2019
Accepted: 25 March 2020
First Online: 10 April 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of Peking University and Duke University. Written informed consents were obtained from all participants during the face-to-face interview.
: Not applicable.
: The authors declare that they have no competing interests.