1. Department of Ophthalmology, Hamad Medical Corporation, Doha, Qatar
2. Department of Ophthalmology, Fattouma Bourguiba University Hospital, Faculty of Medicine, University of Monastir, Monastir, Tunisia
3. Center of Communicable Diseases, Hamad Medical Corporation, Doha, Qatar
4. Department of Rheumatology, Hamad Medical Corporation, Doha, Qatar