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. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry University of Khartoum Khartoum Sudan
4. Department of Pathology Haukeland University Hospital Bergen Norway
5. Khartoum Dental Teaching Hospital Khartoum Sudan