Regulatory T-cells in systemic lupus erythematosus-associated thrombocytopenia: a comparison with idiopathic thrombocytopenic purpura. DOI: 10.1177/0961203309357062. This article first appeared online ahead of print publication on 13 January 2010. Unfortunately one of the authors was accidentally removed from the letter; the full author list should read as follows. S-H Park, J-Y Kim, S-K Kim, J-Y Choe, S-G Kim and H-M Ryoo