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Erratum to: Vitamin K-dependent proteins GAS6 and Protein S and TAM receptors in patients of systemic lupus erythematosus: correlation with common genetic variants and disease activity
Arthritis Research & Therapyvolume 16, Article number: 404 (2014)
The original article was published in Arthritis Research & Therapy 2013 15:R41
The Introduction of this article  contains identical text to a previous research article by Suh and colleagues (cited as reference ) also published in Arthritis Research & Therapy. We apologize for the overlap in the two articles and for the lack of clear attribution.
Recarte-Pelz P, Tàssies D, Espinosa G, Hurtado B, Sala N, Cervera R, Reverter JC, de Frutos PG: Vitamin K-dependent proteins GAS6 and Protein S and TAM receptors in patients of systemic lupus erythematosus: correlation with common genetic variants and disease activity. Arthritis Res Ther. 2013, 15: R41-10.1186/ar4199.
Suh CH, Hilliard B, Li S, Merrill JT, Cohen PL: TAM receptor ligands in lupus: Protein S but not Gas6 levels reflect disease activity in systemic lupus erythematosus. Arthritis Res Ther. 2010, 12: R146-10.1186/ar3088.
The authors declare that they have no competing interests.
The online version of the original article can be found at 10.1186/ar4199
Pedro Recarte-Pelz, Dolors Tàssies contributed equally to this work.