Natural history of multiple system atrophy in the USA: A prospective cohort study

Phillip A. Low, Stephen G. Reich, Joseph Jankovic, Clifford W. Shults, Matthew B. Stern, Peter Novak, Caroline M. Tanner, Sid Gilman, Frederick J. Marshall, Frederick Wooten, Brad Racette, Thomas Chelimsky, Wolfgang Singer, David M. Sletten, Paola Sandroni, Jay Mandrekar