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    Kane D, Balint PV, Sturrock R, Grassi W.Musculoskeletal ultrasound: a state of the art review in rheumatology. Part 1: current controversies and issues in the development of musculoskeletal ultrasound in rheumatology.Rheumatology (Oxford)2004;43:8238.
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    Meenagh G, Filippucci E, Kane D, Taggart A, Grassi W.Ultrasonography in rheumatology: developing its potential in clinical practice and research.Rheumatology (Oxford)2007;46:35.
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    Pineda C, Reginato AM, Flores V, Aliste M, Alva M, Aragon-Lainez RA, et al, for the Pan-American League of Associations for Rheumatology (PANLAR) Ultrasound Study Group.Pan-American League of Associations for Rheumatology (PANLAR) recommendations and guidelines for musculoskeletal ultrasound training in the Americas for rheumatologists.J Clin Rheumatol2010;16:1138.
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    Grassi W, Meenagh G, Pascual E, Filippucci E.“Crystal clear”: sonographic assessment of gout and calcium pyrophosphate deposition disease.Semin Arthritis Rheum2006;36:197202.
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    Thiele RG, Schlesinger N.Diagnosis of gout by ultrasound.Rheumatology (Oxford)2007;46:111621.
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    Filippucci E, Meenagh G, Delle Sedie A, Sakellariou G, Iagnocco A, Riente L, et al.Ultrasound imaging for the rheumatologist XXXVI: sonographic assessment of the foot in gout patients.Clin Exp Rheumatol2011;29:9015.
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    Filippucci E, Riveros MG, Georgescu D, Salaffi F, Grassi W.Hyaline cartilage involvement in patients with gout and calcium pyrophosphate deposition disease: an ultrasound study.Osteoarthritis Cartilage2009;17:17881.
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    Filippucci E, Scire CA, Delle Sedie A, Iagnocco A, Riente L, Meenagh G, et al.Ultrasound imaging for the rheumatologist XXV: sonographic assessment of the knee in patients with gout and calcium pyrophosphate deposition disease.Clin Exp Rheumatol2010;28:25.
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    Fodor D, Albu A, Gherman C.Crystal-associated synovitis: ultrasonographic feature and clinical correlation.Ortop Traumatol Rehabil2008;10:99110.
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    Perez-Ruiz F, Martin I, Canteli B.Ultrasonographic measurement of tophi as an outcome measure for chronic gout.J Rheumatol2007;34:188893.
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    Wakefield RJ, Emery P, Pease C.Gout related upper limb cellulitis: an ultrasound study.J Rheumatol2003;30:4179.
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    Thiele RG, Schlesinger N.Ultrasonography shows disappearance of monosodium urate crystal deposition on hyaline cartilage after sustained normouricemia is achieved.Rheumatol Int2010;30:495503.
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    Wallace SL, Robinson H, Masi AT, Decker JL, McCarty DJ, Yu TF.Preliminary criteria for the classification of the acute arthritis of primary gout.Arthritis Rheum1977;20:895900.
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    Backhaus M, Burmester GR, Gerber T, Grassi W, Machold KP, Swen WA, et al, for the Working Group for Musculoskeletal Ultrasound in the EULAR Standing Committee on International Clinical Studies Including Therapeutic Trials.Guidelines for musculoskeletal ultrasound in rheumatology.Ann Rheum Dis2001;60:6419.
  • 34
    Wakefield RJ, Balint PV, Szkudlarek M, Filippucci E, Backhaus M, D'Agostino MA, et al, for the OMERACT 7 Special Interest Group.Musculoskeletal ultrasound including definitions for ultrasonographic pathology.J Rheumatol2005;32:24857.
  • 35
    Filippucci E, Gabba A, Di Geso L, Girolimetti R, Salaffi F, Grassi W.Hand tendon involvement in rheumatoid arthritis: an ultrasound study.Semin Arthritis Rheum2012;41:75260.
  • 36
    Howard RG, Pillinger MH, Gyftopoulos S, Thiele RG, Swearingen CJ, Samuels J.Reproducibility of musculoskeletal ultrasound for determining monosodium urate deposition: concordance between readers.Arthritis Care Res (Hoboken)2011;63:145662.