Terslev L, Gutierrez M, Christensen R, Balint PV, Bruyn GA, Delle Sedie A, Filippucci E, Garrido J, Hammer HB, Iagnocco A, Kane D, Kaeley GS, Keen H, Mandl P, et al, on behalf of the OMERACT US Gout Task Force. Assessing elementary lesions in gout by ultrasound: results of an OMERACT patient-based agreement and reliability exercise. J Rheumatol. 2015;42:2149-54. The affiliation of co-author Peter Mandl should be Division of Rheumatology, Medical University of Vienna, Vienna, Austria.