Druce KL, Aikman L, Dilleen M, Burden A, Szczypa P, Basu N. Fatigue independently predicts different work disability dimensions in etanercept-treated rheumatoid arthritis and ankylosing spondylitis patients. Arthritis Res Ther. 2018 May 29;20(1):96. doi: 10.1186/s13075-018-1598-8