1 Team Neurosys, INRIA Villers-les-Nancy, France ; Team Neurosys, Centre National de la Recherche Scientifique, LORIA, UMR No. 7503 Villers-les-Nancy, France ; Team Neurosys, University of Lorraine, LORIA, UMR No. 7503 Villers-les-Nancy, France.
2 Department of Anesthesiology, Medical College of Wisconsin Milwaukee, WI, USA.