Affiliation: | 1. Public Dental Health Service, Departments of Hospital Dentistry, M?lndal Hospital and Mun‐H‐Center, Gothenburg, V?stra G?taland Region, Sweden;2. Department of Behavioural and Community Dentistry, Institute of Odontology, The Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden;3. Department of Periodontology, Institute of Odontology, The Sahlgrenska Academy at University of Gothenburg, University of Gothenburg, Gothenburg, Sweden |