Funding for this research was provided by:
Beijing Normal University (the Fundamental Research Funds for the Central Universities)
Text and Data Mining valid from 2018-07-03
Received: 25 September 2017
Accepted: 20 June 2018
First Online: 3 July 2018
Ethics approval and consent to participate
: The research got the ethics approval from the ethics committee of School of Social Development & Public Policy at Beijing Normal University. The reference number is SSDPP-HSC2014003. This article does not report an individual participant’s data. Trained interviewers at respondents’ homes and local nursing homes conducted face-to-face interviews with older adults’ written informed consent.
: The authors declare that they have no competing interests.
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