Text and Data Mining valid from 2020-01-14
Received: 26 September 2019
Accepted: 17 December 2019
First Online: 14 January 2020
Ethics approval and consent to participate
: The present study was approved by the Ethics Committee of Shanghai Xuhui Dental Hospital. The research has been carried out in accordance with the World Medical Association Declaration of Helsinki. All patients and healthy volunteers provided written informed consent prior to their inclusion within the study.
: Not applicable.
: The authors declare that they have no competing interests.