The diagnostic accuracy of dopamine transporter SPECT imaging to detect nigrostriatal cell loss in patients with Parkinson's disease or clinically uncertain parkinsonism: a systematic review - Suwijn, S R; van Boheemen, C J; de Haan, R J; Tissingh, G; Booij, J; de Bie, R M (EJNMMI Res, 2015)