1. Department of Biomedical and Clinical Sciences ‘Luigi Sacco’, University of Milan, 20157 Milan, Italy.
2. Coma Science Group, Cyclotron Research Centre and Neurology Department, University and University Hospital of Liège, 4000 Liège, Belgium.
3. Institute of Science and Technology, Federal University of São Paulo, 12231-280 São José dos Campos, Brazil.
4. Department of Psychiatry, University of Wisconsin, Madison, WI 53719, USA.
5. Istituto Di Ricovero e Cura a Carattere Scientifico, Fondazione Don Carlo Gnocchi, 20148 Milan, Italy.