Xin, Yuejiao
Liu, Yang
Liu, Dandan
Li, Jie
Zhang, Chenying
Wang, Yixiang
Zheng, Shuguo http://orcid.org/0000-0001-6717-5196
Funding for this research was provided by:
National Natural Science Foundation of China (81771053)
Article History
Received: 21 October 2019
Accepted: 22 January 2020
First Online: 1 February 2020
Compliance with Ethical Standards
:
: Yuejiao Xin, Yang Liu, Dandan Liu, Jie Li, Chenying Zhang, Yixiang Wang, and Shuguo Zheng declare that they have no conflict of interest.
: This study was approved by the Ethical Committee of Peking University School and the Hospital of Stomatology (Approval No. PKUSSIRB-2012004) and conducted strictly in accordance with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. All participants signed an informed consent prior to study.