Funding for this research was provided by:
Faculty of Dentistry, University of Oslo
Received: 28 January 2021
Accepted: 20 April 2021
First Online: 8 May 2021
: The study was approved by the Norwegian Regional Committee for Medical and Health Research Ethics (REK 2018/1383) and performed in compliance with the tenets of the Declaration of Helsinki. All participants signed a written informed consent prior to examinations.
: Not applicable.
: The authors declare that they have no competing interests.