Tsifetaki, N. Migkos, M. P. Papagoras, C. Voulgari, P. V. and Athanasakis, K. Drosos, A. A., COUNTING COSTS UNDER SEVERE FINANCIAL CONSTRAINTS: A COST OF ILLNESS ANALYSIS OF SPONDYLOARTHROPATHIES IN GREECE, Annals of the Rheumatic Diseases, (74), 743, 2015, BMJ Publishing Group, 0003-4967, 1468-2060