Liang, Yaping
Xu, Xiaojia
Yin, Mingjuan
Li, Yulian
Zhang, Yan
Huang, Lingfeng
Ni, Jindong
Funding for this research was provided by:
Social science and technology development project of Dongguan, Guangdong, China (201650715000528)
Article History
Received: 28 January 2018
Accepted: 27 June 2018
First Online: 6 July 2018
Ethics approval and consent to participate
: The study has been approved by the Ethics Committee of the affiliation hospital of Guangdong Medical University. All participants enrolled in the study provided written informed consent for participation or, if this was not possible due to advanced dementia situation or illiterate, by close family relatives.
: Not applicable.
: The authors declare that they have no competing interests.
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