Funding for this research was provided by:
Zhejiang Medicine and Health Sciences Research Fund (2019KY184)
Received: 28 August 2019
Accepted: 30 October 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: Not applicable.
: Not applicable. The authors declare that no patient data (details, images or videos relating to individual participants) are included in this article.
: The authors declare that they have no competing interests.