Funding for this research was provided by:
Wenzhou Municipal Science and Technology Bureau (2018ZY016, H20180003)
National Natural Science Foundation of China (11675122)
Received: 28 March 2020
Revised: 29 June 2020
Accepted: 11 August 2020
First Online: 21 August 2020
Compliance with ethical standards
: The scientific guarantor of this publication is Xiance Jin.
: The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.
: One of the authors has significant statistical expertise.
: Written informed consent was waived by the Institutional Review Board.
: Institutional Review Board approval was obtained.
: • retrospective