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Authors
Ma, Jin
Hu, Yin
Lu, Lin
Ding, Xiaohu
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Article History
Received: 21 February 2018
Revised: 14 May 2018
Accepted: 2 June 2018
First Online: 16 June 2018
Compliance with ethical standards
:
: All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest, or on-financial interest in the subject matter or materials discussed in this manuscript.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from the guardians of all infants.
