Prospective differentiation of multiple system atrophy from Parkinson disease, with and without autonomic failure

Axel Lipp, Paola Sandroni, J. Eric Ahlskog, Robert D. Fealey, Kurt Kimpinski, Valeria Iodice, Tonette L. Gehrking, Stephen D. Weigand, David M. Sletten, Jade A. Gehrking, Kim K. Nickander, Wolfgang Singer, Demetrius M. Maraganore, Sid Gilman, Gregor K. Wenning, Clifford W. Shults, Phillip A. Low