New research from two European universities suggests it might be possible to “predict” the onset of Parkinson’s disease seven (or possibly more) years before symptoms appear. The predictive test uses machine learning to analyze blood samples, and with some development it could replace invasive puncture techniques doctors currently use to confirm a diagnosis. But it also presents an ethical dilemma in the health industry… Predictive blood test could forecast Parkinson’s disease ‘several years in advance’Researchers from University College London and University Medical Centre in Goettingen, Swed…