Funding for this research was provided by:
National Key R&D Program of China (2017YFC0907401)
Article History
Received: 23 October 2019
Accepted: 30 April 2020
First Online: 9 May 2020
Compliance with ethical standards
:
: As the study did not include any personal data, it was qualified as negligible risk research and was exempt from the ethical review of the Human Research Ethics Committee of the Shengjing Hospital of China Medical University.
: The authors all consented to publish this article.
: The authors declare that they have no competing interests.