- Correspondence to Professor Philippe P Perrin, Equilibration et Performance Motrice, Nancy-Université, UFR STAPS, 30, rue du Jardin Botanique, 54 600 Villers-lès-Nancy, France;
- Received 8 January 2009
- Revised 10 April 2009
- Accepted 27 April 2009
- Published online 3 August 2010.
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