11. Nijkrake MJ, Keus SH, Ewalds H, Overeem S, et al. (2009). Quality indicators for physiotherapy in Parkinson's disease. European Journal of Physical and Rehabilitation Medicine 45(2):239-45.
12. Snijders AH, Nijkrake MJ, Bakker M, Munneke M, et al. (2008). Clinimetrics of freezing of gait. Movement Disorders 23(2).
13. Nijkrake MJ, Keus SH, Kalf JG, Sturkenboom IH, et al. (2007). Allied health care interventions and complementary therapies in Parkinson's disease. Parkinsonism and Related Disorders 13(3).
14. Nijkrake MJ, Keus SHJ, Kalf JG, Sturkenboom IHWM, et al. (2007). Allied health care interventions and complementary therapies in Parkinson's disease. Parkinsonism and Related Disorders 13(SUPPL. 3):S488-S494.