Different properties of ACPA and IgM-RF derived from a large dataset: further evidence of two distinct autoantibody systems

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Jennie Ursum, Wouter H Bos, Rob J van de Stadt, Ben AC Dijkmans and Dirkjan van Schaardenburg^*

* Corresponding author: Dirkjan van Schaardenburg d.v.schaardenburg@janvanbreemen.nl

Arthritis Research & Therapy 2009, 11:R75 doi:10.1186/ar2704