Affiliation: | 1. Department of Molecular Periodontology, Ume? University, Ume?, Sweden;2. Department of Periodontology, Public Dental Health County Council of G?vleborg, G?vle County Hospital, G?vle, Sweden;3. Center for Research and Development, Uppsala University/Region G?vleborg, G?vle, Sweden;4. Postgraduate Dental Education Center, Region ?rebro County and School of Health and Medical Sciences, ?rebro University, ?rebro, Sweden |