Zhang, Yifei
Zhang, Qian
Funding for this research was provided by:
National Natural Science Foundation of China (81300880)
School of Stomatology, Peking University (PKUSS20170112)
Article History
Received: 7 December 2018
Accepted: 30 January 2019
First Online: 4 February 2019
Ethics approval and consent to participate
: The Institutional Review Board of Peking University School and Hospital of Stomatology approved the study protocol (approval number PKUSSIRB-2013021). All participants provided their written informed consent to participate in this study.
: Not applicable.
: The authors declare that they have no competing interests.
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