1. Donders Institute for Brain, Cognition and Behaviour, Department of Neurology; Radboud University Nijmegen Medical Centre; Nijmegen The Netherlands
2. Department of Medicine; Radboud University Nijmegen Medical Centre; Nijmegen The Netherlands
3. Department of Endocrinology, University of Groningen; University Medical Center Groningen; Groningen The Netherlands
4. Department of Cardiology; Amsterdam Medical Centre, Amsterdam; Amsterdam The Netherlands
5. Department of Neurology and Rudolf Magnus Institute of Neurosciences; University Medical Center Utrecht; Utrecht The Netherlands
6. Department of Neurology, University of Groningen; University Medical Center Groningen; P.O. Box 30.001 9700 RB Groningen The Netherlands