Temporal summation of pain and ultrasound Doppler activity as predictors of treatment response in patients with rheumatoid arthritis: protocol for the Frederiksberg hospitals Rheum... by Christensen, A, Rifbjerg-Madsen, S, Christensen, R, Amris, K, Taylor, P, Locht, H, Ellegaard, K, Torp-Pedersen, S, Jespersen, A, Bartels, E, Danneskiold-Samsøe, B, Bliddal, H