1. Coma Science Group, Cyclotron Research Center, University of Liège, Belgium.
2. Sleep Center, Henri Mondor Hospital, Paris, France.
3. EA 4391, University Paris 12, Paris, France.
4. The Siesta Group, Vienna, Austria.
5. Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria.
6. National Center of Scientific Research, CERCO, Toulouse, France.
7. Department of Neurology, Liege University Hospital, Liege, Belgium.