Fatigue numeric rating scale validity, discrimination and responder definition in patients with psoriatic arthritis
Dafna Gladman, Peter Nash, Hitoshi Goto, Julie A Birt, Chen-Yen Lin, Ana-Maria Orbai, Tore K Kvien
RMD Open Jan 2020, 6 (1) e000928; DOI: 10.1136/rmdopen-2019-000928