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Inter -and intraobserver variation of ultrasonographic cartilage thickness assessments in small and large joints in healthy children

Anne Helene Spannow email, Mogens Pfeiffer-Jensen email, Niels Trolle Andersen email, Elisabeth Stenbøg email and Troels Herlin email

Pediatric Rheumatology 2009, 7:12doi:10.1186/1546-0096-7-12

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