[1] Univ Groningen, Univ Med Ctr Groningen, Dept Neurol, HPC AB51,POB 30-001, NL-9700 RB Groningen, Netherlands
[2] Univ Groningen, Univ Med Ctr Groningen, Sch Behav & Cognit Neurosci, Groningen, Netherlands
[3] Univ Groningen, Univ Med Ctr Groningen, Lab Expt Ophthalmol, Groningen, Netherlands
[4] Univ Groningen, Univ Med Ctr Groningen, Rob Giel Res Ctr, Dept Psychiat, Groningen, Netherlands
[5] Univ Groningen, Dept Clin Neuropsychol, Groningen, Netherlands