Li, Shujiao http://orcid.org/0000-0001-5139-3893
Chen, Chihua http://orcid.org/0000-0002-3547-7584
Qin, Le http://orcid.org/0000-0002-8244-8217
Gu, Shengjia http://orcid.org/0000-0002-5659-5133
Zhang, Huan http://orcid.org/0000-0001-5506-5627
Yan, Fuhua http://orcid.org/0000-0003-4503-5007
Yang, Wenjie http://orcid.org/0000-0002-3959-5043
Article History
Received: 17 December 2019
Accepted: 24 February 2020
First Online: 4 March 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The approval for this study had been granted by the local Institutional Review Board prior to its conduct and informed consent was waived. The study therefore had been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. No patient identifiers were collected, and details that might disclose the identity of the subjects under study should were omitted.