1. Center for Neurodegenerative Diseases (CEMAND), Department of Medicine, Surgery and Dentistry, Neuroscience Section, University of Salerno, Italy
2. Department of Biostatistics, The University of Iowa, Iowa City, IA, USA
3. Department of Neurology, Icahn School of Medicine at Mount Sinai and Mount Sinai Beth Israel, New York, NY, USA
4. Department of Neurology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
5. Weill Institute for Neuroscience, Department of Neurology, University of California–San Francisco, & Parkinson’s Disease Research Education and Clinical Center, San Francisco Veterans Affairs Health Care System, San Francisco, CA, USA
6. Department of Neurology, University of Alabama at Birmingham, Birmingham, AL, USA