Zufferey, P., G. Tamborrini, C. Gabay, A. Krebs, D. Kyburz, B. Michel, U. Moser, P. Villiger, A. So, and H. R. Ziswiler. ‚ÄúRecommendations for the Use of Ultrasound in Rheumatoid Arthritis: Literature Review and SONAR Score Experience‚ÄĚ. Swiss Medical Weekly, vol. 143, no. 5152, Dec. 2013, p. w13861, doi:10.4414/smw.2013.13861.