title: Expression of concern: Ahlin E et al.,"Anti-citrullinated peptide antibodies and rheumatoid factor in Sudanese patients with Leishmania donovani infection", Rev Bras Reumatol 2011; 51(6):572-86.
authors.forename: Paulo
authors.initials: P
authors.lastname: Louzada-Junior
authors.forename: Max Victor Carioca
authors.initials: MV
authors.lastname: Freitas