Funding for this research was provided by:
Shandong Provincial Natural Science Foundation (ZR2021MG010)
Received: 24 November 2021
Accepted: 14 March 2022
First Online: 28 March 2022
: This study has been approved by the Ethics Committee of Centre for Health Management and Policy Research, Shandong University (ECCHMPSDU20210203), and conforms to the ethics guidelines of the Declaration of Helsinki. All participants will be informed about the aim of the study and written informed consent will take from each participant.
: Not applicable.
: The authors declare that they have no competing interests.