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Article History

Received: 18 September 2019

Accepted: 9 October 2019

First Online: 13 November 2019

Ethics approval and consent to participate

: This study was approved by the Institutional Review Board of Seoul National University Dental Hospital (ERI19039).

: This manuscript does not contain any individual person’s identifier (including individual details, images, or videos).

: The authors declare that they have no competing interests.