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Lena Innala, Bozena Möller, Lotta Ljung, Staffan Magnusson, Torgny Smedby, Anna Södergren, Marie-Louise Öhman, Solbritt Rantapää-Dahlqvist and Solveig Wållberg-Jonsson*
* Corresponding author: Solveig Wållberg-Jonsson solveig.wallberg.jonsson@medicin.umu.se
Arthritis Research & Therapy 2011, 13:R131 doi:10.1186/ar3442