1First Division of Neurology, University of Campania, “Luigi Vanvitelli”, Napoli, Italy
2Nuova Casa di Cura D’Anna, Palermo, Italy
3Neurology Unit, IRCCS Neuromed, Pozzilli, IS Italy
4Department NESMOS, “Sapienza” University, Sant’Andrea Hospital, Rome, Italy
5Perugia General Hospital and University of Perugia, Perugia, Italy
6Centro Specialistico Ortopedico Traumatologico G. Pini-CTO Milano, Milan, Italy
7Sapienza University, Rome, Italy
8Department of Neuroscience, University of Torino, Azienda Ospedaliero-Universitaria Città della Salute e della Scienza di Torino, Turin, Italy
9Neurology Unit, Hospital Sant’Anna Ferrara, Ferrara, Italy
10Neurology Unit, Hospital dell’Angelo, Mestre, VE Italy
11Neurology Unit, Policlinico Universitario Monserrato, Cagliari, Italy
12AbbVie Srl, SR 148 Pontina, 04011 Campoverde, LT Italy
13Parkinson and Movement Disorders Unit, Department of Neuroscience, University of Padua, Padua, Italy
© The Author(s) 2020
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.