Funding for this research was provided by:
Yonsei University College of Dentistry (6-2019-0021)
Received: 1 April 2020
Accepted: 10 June 2020
First Online: 18 June 2020
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: For this type of study, formal consent is not required.