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Authors
Sun, Jiantao
Yang, Jiemei
Chi, Jing
Ding, Xue
Lv, Nan
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Funding
Funding for this research was provided by:
Heilongjiang Provincial Department of health (2011-032)
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Article History
Received: 24 September 2018
Accepted: 25 November 2018
First Online: 4 December 2018
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: The authors declare that they have no competing interests.
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