Funding for this research was provided by:
Chinese Medical Association (2016B-KY009)
Received: 7 August 2018
Accepted: 24 October 2019
First Online: 20 November 2019
Ethics approval and consent to participate
: We obtained ethical approval from the Harbin Medical University Research Centre’s ethics committee. This work was carried out in accordance with the Declaration of Helsinki, including but not limited to the anonymity of participants being guaranteed and the informed consent of participants being obtained. All participants received written and verbal information about the research project before providing written consent to participate.
: Not applicable.
: The authors declare that they have no competing interests.