RT Journal Article SR Electronic T1 The effects of deep brain stimulation and levodopa on postural sway in subjects with Parkinson's disease JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 240 OP 240 DO 10.1136/jnnp.73.3.240 VO 73 IS 3 A1 Burn, D J YR 2002 UL http://jnnp.bmj.com/content/73/3/240.abstract AB