Payan, Christine A MViallet, FrançoisLandwehrmeyer, Bernhard GBonnet, Anne-MarieBorg, MichelDurif, FranckLacomblez, LucetteBloch, FrédéricVerny, MarcFermanian, JacquesAgid, YvesLudolph, Albert CLeigh, Peter NBensimon, Gilberton behalf of the NNIPPS Study GroupCounsell, Carl2014-09-192014-09-192011-08-04Payan, C A M, Viallet, F, Landwehrmeyer, B G, Bonnet, A-M, Borg, M, Durif, F, Lacomblez, L, Bloch, F, Verny, M, Fermanian, J, Agid, Y, Ludolph, A C, Leigh, P N, Bensimon, G, on behalf of the NNIPPS Study Group & Counsell, C 2011, 'Disease severity and progression in progressive supranuclear palsy and multiple system atrophy : validation of the NNIPPS - PARKINSON PLUS SCALE', PloS ONE, vol. 6, no. 8, e22293. https://doi.org/10.1371/journal.pone.00222931932-6203ORCID: /0000-0001-6622-7839/work/164505656http://hdl.handle.net/2164/352512404698engR MedicineRJournal article10.1371/journal.pone.002229368