1. Department of Preventive and Community Medicine, University Hospital Tahar Sfar, Mahdia, Tunisia
2. Department of Community Medicine, Faculty of Medicine, University of Monastir, Monastir,Tunisia
3. Research Laboratory, ‘Epidemiology Applied to Maternal and Child Health’, Tunisia
4. Department of Family Medicine and Biobehavioral Health, University of Minnesota Medical School, Duluth, MN, USA