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Authors
Yang, Yuanyuan
Li, Rui
Wang, Jing
Huang, Qingying
Lu, Hong
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Article History
Received: 19 January 2018
Accepted: 17 July 2018
First Online: 31 July 2018
Ethics approval and consent to participate
: Ethical approval was obtained from the Peking University Institutional Review Board, Beijing, China and informed consent was obtained from the healthcare providers before enrollment.
: Not applicable.
: The authors declare that they have no competing interests in this section.
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