Erratum to: Qual Life Res (2011) 20:1543–1553 DOI 10.1007/s11136-011-0004-7

The information in the Acknowledgments section in the original publication was incomplete. The first sentence should read: “This work was funded in part by a NARCOMS Visiting Scientist Fellowship to Dr. Schwartz, which was supported through a Foundation of the Consortium of Multiple Sclerosis Centers grant from EMD Serono, Inc. NARCOMS is supported by the Consortium of Multiple Sclerosis Centers and its Foundation.”