Lee, Yeon-Hee
Hong, Il Ki
An, Jung-Sub
Article History
Received: 21 November 2018
Accepted: 28 January 2019
First Online: 4 April 2019
Compliance with ethical guidelines
:
: Y.-H. Lee, I.K. Hong and J.-S. An declare that they have no competing interests.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Kyung Hee University Dental Hospital and with the 1975 Helsinki declaration and its later amendments or comparable ethical standards. In addition, the study design in the manuscript was approved by the appropriate ethics review boards of Kyung Hee University Dental Hospital. Informed consent was obtained from all individual participants included in the study.