1. Ghajarzadeh M, Foroushani AR, Ghezelbash P, Ghoreishi A, Maghbooli M, Yousefi M, et al. Prevalence of multiple sclerosis (MS) in Zanjan province of Iran. Int J Prev Med. 2020;11.
2. Walton C, King R, Rechtman L, Kaye W, Leray E, Marrie RA, et al. Rising prevalence of multiple sclerosis worldwide: Insights from the Atlas of MS. Multiple Sclerosis Journal. 2020;26(14):1816-21.
3. Mirmosayyeb O, Shaygannejad V, Bagherieh S, Hosseinabadi AM, Ghajarzadeh M. Prevalence of multiple sclerosis (MS) in Iran: a systematic review and meta-analysis. Neurol Sci. 2022;43:233-41.
4. Urits I, Adamian L, Fiocchi J, Hoyt D, Ernst C, Kaye AD, et al. Advances in the understanding and management of chronic pain in multiple sclerosis: a comprehensive review. Curr Pain Headache Rep. 2019;23:1-11.
5. Marrie RA, Reingold S, Cohen J, Stuve O, Trojano M, Sorensen PS, et al. The incidence and prevalence of psychiatric disorders in multiple sclerosis: a systematic review. Multiple Sclerosis Journal. 2015;21(3):305-17.
6. Marck CH, De Livera AM, Weiland TJ, Jelinek PL, Neate SL, Brown CR, et al. Pain in people with multiple sclerosis: associations with modifiable lifestyle factors, fatigue, depression, anxiety, and mental health quality of life. Front Neurol. 2017;8:461.
7. Valentine TR, Alschuler KN, Ehde DM, Kratz AL. Prevalence, co-occurrence, and trajectories of pain, fatigue, depression, and anxiety in the year following multiple sclerosis diagnosis. Multiple Sclerosis Journal. 2022;28(4):620-31.
8. Łabuz-Roszak B, Niewiadomska E, Kubicka-Bączyk K, Skrzypek M, Tyrpień-Golder K, Majewska A, et al. Prevalence of pain in patients with multiple sclerosis and its association with anxiety, depressive symptoms and quality of life. Psychiatr Pol. 2019;53(2):475-86.
9. Heitmann H, Haller B, Tiemann L, Mühlau M, Berthele A, Tölle TR, et al. Longitudinal prevalence and determinants of pain in multiple sclerosis: results from the German National Multiple Sclerosis Cohort study. Pain. 2020;161(4):787-96.
10. Solaro C, Gamberini G, Masuccio FG. Depression in multiple sclerosis: epidemiology, aetiology, diagnosis and treatment. CNS drugs. 2018;32(2):117-33.