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Article History

Received: 1 February 2020

Accepted: 10 May 2020

First Online: 25 May 2020

Ethics approval and consent to participate

: A written informed consent to participate the interview was presented by investigators at the beginning of face-to-face interviews. Eligible participants received written information mail detailing the survey on the aged population prior to a home visit. The interview would be continued if the participants agreed with the written informed consent mail. The survey was approved by the Ministry of Civil Affairs of the People’s Republic of China and carried out by the Institute of Social Science Survey, Peking University.

: Not applicable.

: The author declare that they have no competing interests.