1. University of Oran 1: Ahmed Ben Bella, Faculty of Medicine, Oran, Algeria
2. Department of Epidemiology and Preventive Medicine at EHUO, Oran, Algeria
3. University of Oran 2: Faculty of Sciences, Department of Biology, Oran, Algeria
4. Public Establishment of Proximity Care in Boutlellis, Department of Epidemiology and Preventive Medicine, Boutlellis, Oran, Algeria
5. Canastel Specialized Hospital, Ophthalmology Department, Oran, Algeria