1 UCSF Fresno, Division of Neurology, Fresno, USA.
2 Service of Medical Statistics and Information Technology, Fatebenefratelli Foundation for Healthy Research and Education, Rome, Italy.
3 Brain & Behaviour Research Institute, and School of Psychology, University of Wollongong, Wollongong, Australia.
4 Department of Psychiatry, Temerty Centre for Therapeutic Brain Intervention, Campbell Family Research Institute, Centre for Addiction and Mental Health, University of Toronto, Toronto, Ont., Canada.
5 Danish Research Centre for Magnetic Resonance, Centre for Functional and Diagnostic Imaging and Research, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark; Department of Neurology, Copenhagen University Hospital Bispebjerg, Bispebjerg, Denmark.
6 Department of Neurology & Stroke, and Hertie Institute for Clinical Brain Research, University of Tübingen, Germany. Electronic address: ulf.ziemann@uni-tuebingen.de.