1. Faculty of Medicine, Jordan University of Science and Technology, Irbid, Jordan
2. Department of Internal Medicine, King Abdullah University Hospital, Irbid, Jordan
3. Department of Ophthalmology, Jordan University of Science and Technology, Irbid, Jordan
4. Department of Mathematics and Statistics, Jordan University of Science and Technology, Irbid, Jordan
5. Jordan University of Science and Technology, Irbid, Jordan
6. Division of Rheumatology, University of Illinois at Chicago, Chicago, IL, USA