Funding for this research was provided by:
Natural Science Foundation of Fujian Province (LQ17H260003)
Received: 18 June 2019
Accepted: 31 January 2020
First Online: 14 February 2020
Ethics approval and consent to participate
: The present study was approved by the Ethics Committee of the Hangzhou Normal University School of Medicine. All participants were informed about the study and gave their written consent.
: Neither personal images nor details of individuals are reported within the manuscript. Consent for publication was therefore not requested.
: The authors declare that they have no competing interests.