Due to an error at the publisher's office the name of one of the authors of this article was spelled incorrectly in the 2011 January issue of this journal . Frederick R. Taylor's surname was erroneously spelled as ‘Taylora’. However, the correct list of authors should read: “Ajay Nirula, Scott M. Glaser, Susan L. Kalled and Frederick R. Taylor”.
The publisher apologizes for this error.
1 Nirula A, Glaser SM, Kalled SL, Taylora FR. What is IG4? A review of the biology of a unique immunoglobulin subtype. Curr Opin Rheumatol 2011; (1):119–124.