RT Journal Article SR Electronic T1 Diagnostic biomarkers of Parkinson's disease: what gain at what cost? JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 769 OP 769 DO 10.1136/jnnp-2012-302529 VO 83 IS 8 A1 Kang, Un Jung A1 Xie, Tao YR 2012 UL http://jnnp.bmj.com/content/83/8/769.abstract AB