Authors’ reply to ‘Report of extracranial venous stenosis in relapsing–remitting multiple sclerosis patients’. - Yamout, B.; Herlopian, A.; Issa, Z.; Habib, R. H.; Fawaz, A.; Salame, J.; Wadih, A.; Awdeh, H.; Muallem, N.; Raad, R.; Al-Kutoubi, A. (Multiple Sclerosis Journal, 2011)