D’Amato M. The Crohn’s associated NOD2 3020InsC frameshift mutation does not confer susceptibility to ankylosing spondylitis. J Rheumatol 2002;29:2470–1. In the online version of this work, Drs. Rosa Sorrentino and Sven Pettersson are omitted as authors and should be listed. We regret the omission.