Erratum to: Mod Rheumatol (2008) 18:34–44 DOI 10.1007/s10165-007-0013-0

The correct name of the third member of the Division of Rheumatology, Department of Internal Medicine, Juntendo University School of Medicine in the list of additional members of the GB-0998 Study Group (on page 43, left column) should be given as Ken Yamaji, not Takeshi Yamaji.