A New MRI Measure to Early Differentiate Progressive Supranuclear Palsy From De Novo Parkinson's Disease in Clinical Practice: An International Study. - Quattrone A; Antonini A; Vaillancourt DE; Seppi K; Ceravolo R; Strafella AP; Morelli M; Nigro S; Vescio B; Bianco MG; Vasta R; Arcuri PP; et al. (Movement disorders : official journal of the Movement Disorder Society, 2021)