1. Multiple Sclerosis Center, Sheba Medical Center and The Laura Schwarz-Kipp Research of Autoimmune Diseases, Sackler School of Medicine, Tel-Aviv University, Israel, 2 Derech Sheba, Ramat-Gann, 52621, Israel
2. Multiple Sclerosis Center, Sheba Medical Center, Ramat-Gann, Israel
3. School of Public Health, University of Haifa, Israel
4. Multiple Sclerosis Center, Sheba Medical Center, Ramat-Gann, and Sackler School of Medicine, Tel-Aviv University, Israel