Affiliation: | 1. Department of Oral Sciences, Kristianstad University, , Kristianstad, Sweden;2. Department of Periodontology, University of Bern, , Bern, Switzerland;3. Departments of Periodontics and Oral Medicine, University of Washington, , Seattle, WA, USA;4. School of Dental Sciences, Trinity Collage, , Dublin, Ireland;5. Blekinge Institute of Technology, , Karlskrona, Sweden |