1. Department of Dental Medicine, Unit for Oral Diagnostics and Surgery, Karolinska Institutet, Huddinge, Sweden;
2. Tandvårdens Kompetenscentrum, County of Norrbotten, Luleå, Sweden;
3. The Research and Innovation Unit, County of Norrbotten, Luleå, Sweden;
4. Academic Centre of Geriatric Dentistry, Stockholms Sjukhem, Stockholm, Sweden