Discordances between clinical and ultrasound measurements of disease activity among RA patients followed in real life. - Zufferey, Pascal; Courvoisier, Delphine S.; Nissen, Michael J.; Möller, Burkhard; Brulhart, Laure; Ziswiler, Hans Ruedi; Tamborrini, Giorgio; Ciurea, Adrian; D'Agostino, Maria-Antonietta; Finckh, Axel (Joint Bone Spine, 2020)