title: Serotonergic loss underlying apathy in Parkinson's disease.
authors: Department of Clinical Neurosciences, UCL Institute of Neurology, Royal Free campus, London, UK a.schrag@ucl.ac.uk.
authors: Anette
authors: A
authors: Schrag
authors: Neurodegeneration Imaging Group, Institute of Psychiatry, Psychology and Neuroscience (IoPPN), King's College London, London, UK.
authors: Marios
authors: M
authors: Politis
mesh_terms: D057565:Apathy; D006801:Humans; D010300:Parkinson Disease