Open Label Studies in PD are Still Useful

Copyright: ©2015 Jost WH. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited *Corresponding author: Wolfgang H. Jost, Professor of Neurology, University of Freiburg / Parkinson-Klinik Wolfach, Germany, E-mail: w.jost@parkinson-klinik.de