Correction
In our study [1], we neglected to obtain formal permission to use the correct version of PRIMUS [2]. Therefore after publication we asked the Publisher to remove the results obtained with the PRIMUS tool and the data associated with it. Although amendments were included in the pdf version of the article by the Publisher, the website xml version was left unchanged. To remove confusion, please use the corrected pdf version of the article that can be downloaded here: http://www.hqlo.com/content/pdf/1477-7525-10-70.pdf.
The authors and the Publisher apologize to the readers and the owners of PRIMUS for the inconvenience caused.
References
Wicks P, Vaughan TE, Massagli MP: The multiple sclerosis rating scale, revised (MSRS-R): Development, refinement, and psychometric validation using an online community. Health Qual Life Outcomes 2012, 10: 70. 10.1186/1477-7525-10-70
Doward LC, McKenna SP, Meads DM, Twiss J, Eckert BJ: The development of patient-reported outcome indices for multiple sclerosis (PRIMUS). Mult Scler 2009,15(9):1092–1102. 10.1177/1352458509106513
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The online version of the original article can be found at 10.1186/1477-7525-10-70
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This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Wicks, P., Vaughan, T.E. & Massagli, M.P. Retraction Note: The multiple sclerosis rating scale, revised (MSRS-R): development, refinement, and psychometric validation using an online community. Health Qual Life Outcomes 11, 60 (2013). https://doi.org/10.1186/1477-7525-11-60
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DOI: https://doi.org/10.1186/1477-7525-11-60