[1] Radboud University Nijmegen Medical Centre,Dept. of Neurology (HP 935)
[2] University Hospital Basel,Dept. of Otorhinolaryngology
[3] University of British Columbia,School of Human Kinetics
[4] Radboud University Nijmegen Medical
Centre,Dept. of Geriatrics
[5] University Hospital of Amsterdam,Dept. of Neurology,
Academic Medical Center
[6] Radboud University Nijmegen Medical
Centre,Dept. of Epidemiology and Biostatistics