1. 1 Department of Internal Medicine , Hédi Chaker Hospital, University of Sfax Faculty of Medicine Sfax , Tunisia
2. 2 Department of Pathology and Research Laboratory LR18SP10 , Habib Bourguiba University Hospital , Sfax , Tunisia
3. 3 Ophthalmology Department , Habib Bourguiba Hospital, University of Sfax Faculty of Medicine Sfax , Tunisia