Morley, JF; Cohen, A; Silveira-Moriyama, L; Lees, AJ; Williams, DR; Katzenschlager, R; Hawkes, C; ... Duda, JE; + view all Morley, JF; Cohen, A; Silveira-Moriyama, L; Lees, AJ; Williams, DR; Katzenschlager, R; Hawkes, C; Shtraks, JP; Weintraub, D; Doty, RL; Duda, JE; - view fewer (2018) Optimizing olfactory testing for the diagnosis of Parkinson's disease: item analysis of the university of Pennsylvania smell identification test. npj Parkinson's Disease , 4 , Article 2. 10.1038/s41531-017-0039-8.