1. Jankovic J (2008) Parkinson’s disease: clinical features and diagnosis. J Neurol Neurosurg Psychiatry 79:368–376 [PubMed: 18344392]
2. Fahn S, Elton RL (1987) The Unified Parkinsons disease rating scale. In: Fahn S, Marsden CD, Calne DB, Goldstein M (eds) Recent developments in Parkinsons disease. Macmillan Healthcare Information, Florham Park, N.J, pp 153–163
3. Antoniades CA, Barker RA (2008) The search for biomarkers in Parkinsons disease: a critical review. Expert Rev 8(12):1841–1852
4. Morgan JC, Mehta SH, Sethi KD (2010) Biomarkers in Parkinsons disease. Curr Neurol Neurosci Rep 10:423–430 [PubMed: 20809400]
5. Strauss E, Lasker Foundation (2014) Lasker~DeBakey Clinical Medical Research Award to Alim Louis Benabid and Mahlon DeLong. Award description: for the development of deep brain stimulation of the subthalamic nucleus, a surgical technique that reduces tremors and restores motor function in patients with advanced Parkinson’s disease, pp 1–4.
http://www.laskerfoundation.org/awards/2014_c_description.htm