1. Mitchell AJ, Benito-León J, González JM, Rivera-Navarro J. Quality of life and its assessment in multiple sclerosis: integrating physical and psychological components of wellbeing. Lancet Neurol. 2005; 4:556–566.
Article
2. Feinstein A. The neuropsychiatry of multiple sclerosis. Can J Psychiatry. 2004; 49:157–163.
Article
3. Miller DM, Kinkel RP. Health-related quality of life assessment in multiple sclerosis. Rev Neurol Dis. 2008; 5:56–64.
Article
4. Solari A. Role of health-related quality of life measures in the routine care of people with multiple sclerosis. Health Qual Life Outcomes. 2005; 3:16.
Article
5. Nortvedt MW, Riise T. The use of quality of life measures in multiple sclerosis research. Mult Scler. 2003; 9:63–72.
Article
6. Hobart J, Lamping D, Fitzpatrick R, Riazi A, Thompson A. The Multiple Sclerosis Impact Scale (MSIS-29): a new patient-based outcome measure. Brain. 2001; 124(Pt 5):962–973.
Article
7. Simeoni M, Auquier P, Fernandez O, Flachenecker P, Stecchi S, Constantinescu C, et al. Validation of the Multiple Sclerosis International Quality of Life questionnaire. Mult Scler. 2008; 14:219–230.
Article
8. Beiske AG, Baumstarck K, Nilsen RM, Simeoni MC. Validation of the multiple sclerosis international quality of life (MusiQoL) questionnaire in Norwegian patients. Acta Neurol Scand. 2012; 125:171–179.
Article
9. Smedal T, Johansen HH, Myhr KM, Strand LI. Psychometric properties of a Norwegian version of Multiple Sclerosis Impact Scale (MSIS-29). Acta Neurol Scand. 2010; 122:244–251.
Article
10. Triantafyllou N, Triantafillou A, Tsivgoulis G. Validity and Reliability of the Greek Version of the Multiple Sclerosis International Quality-of-Life Questionnaire. J Clin Neurol. 2009; 5:173–177.
Article
11. Jamroz-Wiśniewska A, Stelmasiak Z, Bartosik-Psujek H. Validation analysis of the Polish version of the Multiple Sclerosis International Quality of Life Questionnaire (MusiQoL). Neurol Neurochir Pol. 2011; 45:235–244.
Article
12. Kurtzke JF. Rating neurologic impairment in multiple sclerosis: an expanded disability status scale (EDSS). Neurology. 1983; 33:1444–1452.
Article
13. Krupp LB, LaRocca NG, Muir-Nash J, Steinberg AD. The fatigue severity scale. Application to patients with multiple sclerosis and systemic lupus erythematosus. Arch Neurol. 1989; 46:1121–1123.
14. Spitzer RL, Kroenke K, Williams JB. Validation and utility of a self-report version of PRIME-MD: the PHQ primary care study. Primary Care Evaluation of Mental Disorders. Patient Health Questionnaire. JAMA. 1999; 282:1737–1744.
Article
15. Choi HS, Choi JH, Park KH, Joo KJ, Ga H, Ko HJ, et al. Standardization of the Korean version of Patient Health Questionnaire-9 as a screening instrument for major depressive disorder. J Korean Acad Fam Med. 2007; 28:114–119.
16. Kline P. An Easy Guide to Factor Analysis. New York: Routledge;1994.
17. Campbell DT, Fiske DW. Convergent and discriminant validation by the multitrait-multimethod matrix. Psychol Bull. 1959; 56:81–105.
Article
18. McHorney CA, Tarlov AR. Individual-patient monitoring in clinical practice: are available health status surveys adequate? Qual Life Res. 1995; 4:293–307.
Article
19. Cronbach LJ. Coefficient alpha and the internal structure of tests. Psychometrika. 1951; 16:297–334.
Article
20. Shrout PE, Fleiss JL. Intraclass correlations: uses in assessing rater reliability. Psychol Bull. 1979; 86:420–428.
Article
21. Wright BD, Stone MH. Best Test Design. Chicago: MESA Press;1979.
22. Gold SM, Heesen C, Schulz H, Guder U, Mönch A, Gbadamosi J, et al. Disease specific quality of life instruments in multiple sclerosis: validation of the Hamburg Quality of Life Questionnaire in Multiple Sclerosis (HAQUAMS). Mult Scler. 2001; 7:119–130.
Article
23. Cohen J. Statistical Power Analysis for the Behavioral Sciences. 2nd ed. Hillsdale: Lawrence Erlbaum Associates;1988.
24. Fruehwald S, Loeffler-Stastka H, Eher R, Saletu B, Baumhackl U. Depression and quality of life in multiple sclerosis. Acta Neurol Scand. 2001; 104:257–261.
Article
25. Benedict RH, Wahlig E, Bakshi R, Fishman I, Munschauer F, Zivadinov R, et al. Predicting quality of life in multiple sclerosis: accounting for physical disability, fatigue, cognition, mood disorder, personality, and behavior change. J Neurol Sci. 2005; 231:29–34.
Article
26. Patti F, Amato MP, Trojano M, Bastianello S, Tola MR, Picconi O, et al. Quality of life, depression and fatigue in mildly disabled patients with relapsing-remitting multiple sclerosis receiving subcutaneous interferon beta-1a: 3-year results from the COGIMUS (COGnitive Impairment in MUltiple Sclerosis) study. Mult Scler. 2011; 17:991–1001.
Article
27. Bakshi R, Shaikh ZA, Miletich RS, Czarnecki D, Dmochowski J, Henschel K, et al. Fatigue in multiple sclerosis and its relationship to depression and neurologic disability. Mult Scler. 2000; 6:181–185.
Article