Yan, Yue
Zhan, Yalin
Wang, Xian’e
Hou, Jianxia
Article History
Received: 22 July 2019
Accepted: 28 December 2019
First Online: 28 January 2020
Ethics approval and consent to participate
: The trial was approved by the Ethics Committee of Peking University School and Hospital of Stomatology (PKUSSIRB-201734032). The trial complies with the Standard Protocol Items: Recommendations for Interventional Trials (SPIRIT) Checklist. Informed consent will be obtained from all study participants. Before subjects participate in this trial, the consent form must be signed.
: Not applicable
: The authors declare that they have no competing interests.