Funding for this research was provided by:
Graduate School and Faculty of Dentistry, Prince of Songkla University
Article History
Received: 4 December 2017
Accepted: 17 May 2019
First Online: 25 May 2019
Compliance with ethical standards
:
: The authors declare no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Research Ethics Committee (EC5810-30-P-LR), Faculty of Dentistry, Prince of Songkla University and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.