Multimodal intervention improves fatigue and quality of life in subjects with progressive multiple sclerosis: a pilot study [Corrigendum]

This article refers to:

Multimodal intervention improves fatigue and quality of life in subjects with progressive multiple sclerosis: a pilot study

Bisht B, Darling WG, Shivapour ET, et al. Degenerative Neurological and Neuromuscular Disease. 2015;5:19–35.

The authors have recently learnt of a registered copyright for the MS Performance Scales. See Performance Scales, Copyright Registration Number/ Date: TXu000743629/ 1996–04–04; assigned to Delta Quest Foundation, Inc., effective October 1, 2005.¹ The authors failed to report that Performance Scales© is a copyrighted work and is owned by DeltaQuest Foundation. US Copyright law governs the exclusive rights of DeltaQuest Foundation, Inc. to the Performance Scales©. Under US law a copyrighted work cannot be reproduced in copies, prepared into derivative works, distributed in copies for sale, or displayed to the public without the explicit permission of and/or license from the copyright owner. In addition, reference of original validation study for Performance Scales by Schwartz et al,² was not provided in the article. To address the issue, we would like to provide correct information to the readers and clarify that copyright of Performance Scales© is owned by DeltaQuest Foundation and information regarding Performance Scales© can be found in the paper by Schwartz et al.² Authors would also like to clarify that only questions related to fatigue in Performance Scales© were used to report fatigue data in the study and were abbreviated as PS-fatigue.