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Häkkinen A, Arkela-Kautiainen M, Sokka T, Hannonen P, Kautiainen H.Häkkinen A, et al. Among authors: hannonen p.J Rheumatol. 2009 Feb;36(2):246-53. doi: 10.3899/jrheum.080027.J Rheumatol. 2009.PMID: 19040312