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Table 2 The percentage distribution of the cost categories for the total costs or direct costs from cost-of-illness studies in ankylosing spondylitis Boonen A (2006) A review of work-participation, cost-of-illness and cost-effectiveness studies in ankylosing spondylitis Nat Clin Pract Rheumatol 2: 546–553 doi:10.1038/ncprheum0297