1. The Gade Laboratory for Pathology, and Centre for Cancer Biomarkers (CCBIO), Department of Clinical Medicine, Faculty of Medicine University of Bergen Bergen Norway
2. Centre for International Health, Department of Global Public Health and Primary Care, Faculty of Medicine University of Bergen Bergen Norway
3. Institute of Clinical Dentistry, Faculty of Medicine University of Bergen Bergen Norway
4. Department of Operative Dentistry University of Science & Technology Omdurman Sudan
5. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry University of Khartoum Khartoum Sudan
6. Khartoum Dental Teaching Hospital Khartoum Sudan
7. Department of Pathology Haukeland University Hospital Bergen Norway