Corrigendum to 25-hydroxyvitamin D in cerebrospinal fluid during relapse and remission of multiple sclerosis by Trygve Holmø, Stine Marit Moen, Thomas A Gundersen, Michael F Holick, Enrico Fainardi, Massimiliano Castellazzi and Ilaria Casetta. 15(11) 1280-1285 [DOI: 10.1177/1352458509107008]. The third author name was published incorrectly. The correct name is 'Thomas E Gundersen'.