Serum COMP-C3b and COMP in patients with rheumatologic diseases. Serum COMP-C3b (a) and COMP (b) were measured in patients with different rheumatologic diseases. The horizontal bar indicates the median of each group. Statistical significance of differences between disease groups and controls was measured by using a Kruskal-Wallis test with a Dunn multiple comparison posttest. ***P < 0.001; **P < 0.01; *P < 0.05; ns, not significant.
Happonen et al. Arthritis Research & Therapy 2012 14:R15 doi:10.1186/ar3694