1 Department of Neurology, University Medicine of Greifswald, Greifswald, Germany. Electronic address: matthias.grothe@med.uni-greifswald.de.
2 Imaging and Neurostimulation, Department of Neurology, University Medical Center of the Johannes Gutenberg University Mainz, Germany.
3 Department of Neurology, University Medicine of Greifswald, Greifswald, Germany.
4 Movement Neuroscience Laboratory, Department of Exercise Sciences, The University of Auckland, Auckland, New Zealand; Centre for Brain Research, University of Auckland, Auckland, New Zealand.
5 Institute for Community Medicine, University Medicine Greifswald, 17475 Greifswald, Germany.