Funding for this research was provided by:
Stockholms Läns Landsting
Received: 25 March 2020
Accepted: 8 June 2020
First Online: 29 June 2020
Ethics approval and consent to participate
: The study was approved by the Regional Ethical Review Board in Stockholm (DNR: 2014/1394–3), and followed the principles for medical research according to guidelines of the Declaration of Helsinki [CitationRef removed]. The participants were recruited by advertisement at the Department of Dental Medicine, Karolinska Institutet, Huddinge, Sweden. Before inclusion, all participants were given both verbal as well as written information about this study and an informed written consent was obtained.
: Participant was given both verbal as well as written information about this study and an informed written consent for image publication including individual details was obtained.
: The authors declare no conflicts of interest.