Affiliation: | 1. Department of Biomedicine, University of Bergen, Bergen, Norway;2. Department of Clinical Dentistry, Periodontology, University of Bergen, Bergen, Norway;3. Centre for Medical Genetics and Molecular medicine, Haukeland University Hospital, University of Bergen, Bergen, Norway;4. Department of Clinical Dentistry, Centre for Clinical Dental Research, University of Bergen, Bergen, Norway;5. Department of Oral and Maxillofacial Surgery, Khartoum Dental Teaching Hospital, Sudan |