1) Wakefield RJ et al: Musculoskeletal ultrasound in- cluding definitions for ultrasonographic pathology. The Journal of rheumatology 32(12): 2485-7, 2005
3) Wakefield RJ et al: Should oligoarthritis be reclassi- fied? Ultrasound reveals a high prevalence of sub- clinical disease. Ann Rheum Dis 63(4): 382-5, 2004
4) Naredo E et al: Assessment of inflammatory activity in rheumatoid arthritis: a comparative study of clini- cal evaluation with grey scale and power Doppler ultrasonography. Ann Rheum Dis 64(3): 375-81, 2005
5) Nakagomi D et al: Confirming the presence of synovi- tis with ultrasound improves the accuracy of 2010 ACR/EULAR classification criteria for rheumatoid arthritis. Arthritis Rheum, in press