Validity and reliability of the Danish and Swedish versions of the Bristol Rheumatoid Arthritis Fatigue Questionnaires in patients with spondyloarthritis. - Damgaard AJ; Mogard E; Primdahl J; Bremander A; Dures E; Lindqvist E; Krarup HF; Graversgaard J; Knak KL (Scandinavian journal of rheumatology, 2025)