[1] Sint Lucas Andreas Hosp, Dept Neurol, Amsterdam, Netherlands
[2] Vrije Univ Amsterdam Med Ctr, Dept Radiol, Amsterdam, Netherlands
[3] Vrije Univ Amsterdam Med Ctr, Dept Phys & Med Technol, Amsterdam, Netherlands
[4] Vrije Univ Amsterdam Med Ctr, Dept Neurol, Amsterdam, Netherlands