Received: 27 May 2021
Accepted: 28 July 2021
First Online: 4 August 2021
: This study was conducted in accordance with the Declaration of Helsinki and approved by the Medical Ethics Committee of Shanxi Medical University (numbers of ethics approval: 2013099, 2018LL128). Participants were informed of the study objectives in written and oral form prior to data collection. All individuals who were willing to participate have signed the written informed consent.
: Not applicable.
: We declare that the authors have no competing interests.