[1] Leiden Univ, Med Ctr, Dept Phys Therapy, NL-2300 RA Leiden, Netherlands
[2] RUNMC, Dept Neurol, Nijmegen, Netherlands
[3] Dutch Inst Allied Hlth Care NPi, Dept Res & Dev, Amersfoort, Netherlands
[4] Maastricht Univ, Dept Epidemiol, Maastricht, Netherlands
[5] Maastricht Univ, CEBP, Maastricht, Netherlands
[6] RUNMC, Res Ctr Allied Hlth Care, Dept Phys Therapy, Nijmegen, Netherlands