1. Department of Neurology, Christian Doppler Clinic, Paracelsus Medical University, 5020 Salzburg, Austria
2. Department of Neurology, Franz Tappeiner Hospital, Via Rossini 5, 39012 Meran/o, Italy
3. Neuroscience Institute, Christian Doppler Clinic, 5020 Salzburg, Austria
4. Department of Physiology, Medical University of Graz, 8010 Graz, Austria