The burden of Parkinson disease (PD) and concomitant comorbidities.
Arch Gerontol Geriatr. 2009 Sep-Oct;49(2):317-321. doi: 10.1016/j.archger.2008.11.006. Epub 2009 Jan 8.
Arch Gerontol Geriatr. 2009.
PMID: 19135266