@article {Williams396, author = {Adrian Williams}, title = {Parkinson{\textquoteright}s disease in the older patient, 2nd edition}, volume = {9}, number = {4}, pages = {396--396}, year = {2009}, doi = {10.7861/clinmedicine.9-4-396}, publisher = {Royal College of Physicians}, issn = {1470-2118}, URL = {https://www.rcpjournals.org/content/9/4/396.1}, eprint = {https://www.rcpjournals.org/content/9/4/396.1.full.pdf}, journal = {Clinical Medicine} }