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Authors
Yu, Zengli
Zheng, Canjie
Zheng, Wangfeng
Wan, Zhongxiao
Bu, Yongjun
Zhang, Guofu
Ding, Shibin
Wang, Erhui
Zhai, Desheng
Ma, Zheng Feei https://orcid.org/0000-0002-7276-2229
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Article History
Received: 18 December 2019
Accepted: 16 June 2020
First Online: 28 June 2020
Compliance with ethical standards
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: All procedures performed in the retrospective study involving human participants were in accordance with the ethical standards of the Ethics Committee of the Zhejiang Provincial Center for Disease Control and Prevention and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: The authors declare that they have no conflict of interest.
