Liu, Qianqian
Huang, Shusheng
Qu, Xiaoyuan
Yin, Aitian
Article History
Received: 16 January 2021
Accepted: 25 May 2021
First Online: 15 June 2021
Declarations
:
: The study was conducted and approved by Ethics Committee of Centre for Health Management and Policy Research, School of Public Health, Cheeloo College of Medicine, Shandong University, and all the participants had given their informed consent.
: Not applicable.
: The authors declare that they have no competing interests.