Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleVariable association of anti-CCP positivity with serum ferritin may be corrected by APF test.AuthorsDuck-An Kim; Think-You KimAbstractA letter to the editor is presented in response to an article on variable association of anti-CCP positivity with serum ferritin that was published in the September 25, 2009 issue.SubjectsLETTERS to the editor; SERUMPublicationRheumatology International, 2010, Vol 30, Issue 7, p997ISSN0172-8172Publication typeLetterDOI10.1007/s00296-009-1143-9