The above article, published online on 13 February 2015 in Wiley Online Library Early View (wileyonlinelibrary.com), has been retracted by agreement between the authors, the journal editors, Bernard Dan and Peter Rosenbaum, the MacKeith Press and John Wiley & Sons Ltd. The retraction has been made due to concerns relating to the validity of the EMG methodology and its interpretation, which affect the results of the paper.
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