1 Department of Public Health Sciences, Karolinska Institutet, Tomtebodavägen 18a, 17177 Solna, Stockholm, Sweden; Centre for Epidemiology and Community Medicine, Stockholm Health Care District, Box 1497, 171 29 Solna, Sweden. Electronic address: rosaria.galanti@ki.se.
2 Department of Public Health Sciences, Karolinska Institutet, Tomtebodavägen 18a, 17177 Solna, Stockholm, Sweden. Electronic address: suvi.virtanen@ki.se.
3 Department of Public Health Sciences, Karolinska Institutet, Tomtebodavägen 18a, 17177 Solna, Stockholm, Sweden; Centre for Epidemiology and Community Medicine, Stockholm Health Care District, Box 1497, 171 29 Solna, Sweden. Electronic address: zangin.zeebari@ki.se.
4 Dentistry Clinic Solvändan, Sörmland Health Care Region, Folktandvården Sörmland AB, Folktandvården Marie Box 134, 647 23 Mariefred, Sweden. Electronic address: izloo@hotmail.com.