Analysis of four scales for global severity evaluation in Parkinson’s disease

Research project: (a) conception: P.M.-M., M.M., K.R.C.; (b) organization: P.M.-M., C.R.B., M.M.; (c) execution: M.R.-V., M.S.-D., N.G., J.C.M.-C., V.C.A., W.F., P.C., T.A., M.A., I.P.I. Statistical analysis: (a) design: P.M.-M., J.M.R.-A.; (b) execution: P.M.-M., J.M.R.-A.; (c) review and critique: all co-authors. Manuscript preparation: (a) writing of the first draft: P.M.-M.; (b) review and critique: all co-authors