Text and Data Mining valid from 2019-06-06
Received: 12 February 2019
Accepted: 20 May 2019
First Online: 6 June 2019
Ethics approval and consent to participate
: The study was approved at the University of Zagreb, School of dental medicine by Ethics Committee (01-PA-26-6/15, item 3.2) and regulated in accordance with the Helsinki Declaration. All subjects were informed and provided written consent before being involved in the research.
: Not applicable.
: The authors declare that they have no competing interests.