Department of Neurology, Amsterdam UMC, University of Amsterdam, Meibergdreef 9 1105 AZ Amsterdam, The Netherlands. Department of Neurology, University Medical Center, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands. Department of Clinical Epidemiology, Amsterdam UMC, University of Amsterdam, Meibergdreef 9 1105 AZ Amsterdam, The Netherlands. Department of Neurology, Radboud University Medical Center, Geert Grooteplein Zuid 10, 6525 GA Nijmegen, The Netherlands. Department of Neurology, Maastricht Academic Medical Center, P. Debyelaan 25, 6229 HX Maastricht, The Netherlands. Department of Neurology, Elisabeth-Tweesteden Hospital, Hilvarenbeekse weg 60, 5022 GC Tilburg, The Netherlands. Department of Neurology, Albert Schweitzer Hospital, Albert Schweitzerplaats 25 3318 AT Dordrecht, The Netherlands. Department of Neurology, Erasmus Medical Center, Doctor Molewaterplein 40, 3015 GD Rotterdam, The Netherlands. Department of Neurology, Curaçao Medical Center, 193 JHJ. Hamelbergweg, Willemstad, Curacao, The Netherlands. Board of directors, Spaarne Gasthuis, Boerhaavelaan 22, 2035 RC Haarlem, The Netherlands.