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Authors
Li, Ting
Zhang, Xiaolin
Shi, Hong
Ma, Zhe
Lv, Bingjian
Xie, Meng
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Article History
Received: 6 December 2017
Accepted: 5 July 2018
First Online: 12 July 2018
Compliance with ethical standards
: The study was approved by the Research Ethics Committee of Stomatological Hospital, Hebei Medical University. This was a meta-analysis so an informed consent was not required. This article does not contain any studies with human participants or animals.
: The authors declare that they have no conflict of interest.
