REFERENCES
1. Heiberg T, Lie E, van der Heijde D, Kvien TK. Sleep problems are of higher priority for improvement for patients with ankylosing spondylitis than for patients with other inflammatory arthropathies. Ann Rheum Dis. 2011; 70:872–3.
2. Deodhar A, Braun J, Inman RD, Mack M, Parasuraman S, Buchanan J, et al. Golimumab reduces sleep disturbance in patients with active ankylosing spondylitis: results from a randomized, placebo-controlled trial. Arthritis Care Res (Hoboken). 2010; 62:1266–71.
3. Rudwaleit M, Gooch K, Michel B, Herold M, Thörner A, Wong R, et al. Adalimumab improves sleep and sleep quality in patients with active ankylosing spondylitis. J Rheumatol. 2011; 38:79–86.
4. Jeong HJ, Lee TH, Lee JM, Choi G, Son CN, Kim JM, et al. Sleep disturbances in korean patients with ankylosing spondylitis are associated with increased disease activity. J Rheum Dis. 2014; 21:241–7.
5. Hultgren S, Broman JE, Gudbjörnsson B, Hetta J, Lindqvist U. Sleep disturbances in outpatients with ankylosing spondylitisa questionnaire study with gender implications. Scand J Rheumatol. 2000; 29:365–9.
6. Da Costa D, Zummer M, Fitzcharles MA. Determinants of sleep problems in patients with spondyloarthropathy. Musculoskeletal Care. 2009; 7:143–61.
7. Li Y, Zhang S, Zhu J, Du X, Huang F. Sleep disturbances are associated with increased pain, disease activity, depression, and anxiety in ankylosing spondylitis: a case-control study. Arthritis Res Ther. 2012; 14:R215.
8. Hakkou J, Rostom S, Mengat M, Aissaoui N, Bahiri R, Hajjaj-Hassouni N. Sleep disturbance in Moroccan patients with ankylosing spondylitis: prevalence and relationships with disease-specific variables, psychological status and quality of life. Rheumatol Int. 2013; 33:285–90.
9. Batmaz İ, Sarı yı ldız MA, Dilek B, Bez Y, Karakoç M, Çevik R. Sleep quality and associated factors in ankylosing spondylitis: relationship with disease parameters, psychological status and quality of life. Rheumatol Int. 2013; 33:1039–45.
10. Lehman AJ, Ireland K, Da Costa D. Awakening research on Sleep and Spondyloarthropathy. Journal of Clinical Rheumatology & Musculoskeletal Medicine. 2012; 3:9–18.
11. Karadağ O, Nakas D, Kalyoncu U, Akdoğan A, Kiraz S, Ertenli I. Effect of anti-TNF treatment on sleep problems in ankylosing spondylitis. Rheumatol Int. 2012; 32:1909–13.
12. Jones SD, Koh WH, Steiner A, Garrett SL, Calin A. Fatigue in ankylosing spondylitis: its prevalence and relationship to disease activity, sleep, and other factors. J Rheumatol. 1996; 23:487–90.
13. Barlow JH, Macey SJ, Struthers GR. Gender, depression, and ankylosing spondylitis. Arthritis Care Res. 1993; 6:45–51.