Correction to: Spinal Cord (2014) 52, 145–151; doi:10.1038/sc.2013.132; published online 3 December 2013

Since the publication of this article, the authors have noticed that the research grant number for the support of the Technical Department of Zhejiang Province, China, 2008C33044, is incorrect. The correct research grant number is 2012C33061.

The authors apologize for any inconvenience caused.