Zufferey, Pascal, Giorgio Tamborrini, Cem Gabay, Andreas Krebs, Diego Kyburz, Beat Michel, Urs Moser, Peter Villiger, Alexander So, and Hans Ruedi Ziswiler. 2013. “Recommendations for the Use of Ultrasound in Rheumatoid Arthritis: Literature Review and SONAR Score Experience”. Swiss Medical Weekly 143 (5152):w13861. https://doi.org/10.4414/smw.2013.13861.