Cong, Lin
Gao, Han
Ma, Weining
Article History
Received: 8 December 2019
Revised: 20 February 2020
Accepted: 25 February 2020
First Online: 11 March 2020
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: This study conformed to Ethical Guidelines for Medical and Health Research Involving Human Subjects endorsed by the Chinese government.