Funding for this research was provided by:
Srinakharinwirot University (259/60)
Text and Data Mining valid from 2019-08-01
Received: 27 January 2019
Accepted: 4 July 2019
First Online: 1 August 2019
Ethics approval and consent to participate
: The study was approved by the ethical committee for research in human subjects, Number DENTSWU-EC22/2560, the Faculty of Dentistry, Srinakharinwirot University, Thailand. All patients signed an informed consent before enrolled into the study.
: All participating patients gave informed written consent to participate in the retrospective study and for publication of the obtained data.
: The authors declare that they have no competing interests.