1. Department of Family and Community Medicine, Taibah University, Medina, Saudi Arabia
2. Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
3. Department of Family and Community Medicine, University of Gezira, Medani, Sudan
4. National Centre for Emergency Primary Health Care, Uni Research, Bergen, Norway
5. Department of Community Medicine, Faculty of Medicine, University of Khartoum, Khartoum, Sudan