1. Risk factors associated with multiple sclerosis: a case-control study in Damascus, Syria;Taan;Mult. Scler. Int.,2021
2. Selection of cases and controls;Lasky;Epidemiol. Rev.,1994
3. The spectrum of multiple sclerosis and treatment decisions;Siva;Clin. Neurol. Neurosurg.,2006
4. Epidemiology: Beyond the Basics;Szklo,2014
5. A Pocket Guide to Epidemiology;Kleinbaum,2007