Funding for this research was provided by:
Ministero della Salute (GR-2016-02363848, and RC2017-2019)
Received: 18 July 2020
Accepted: 2 October 2020
First Online: 16 October 2020
Ethics approval and consent to participate
: The study was approved by the local Ethics Committee (N° p-20170023682) and all subjects enrolled signed at T0 a written informed consent, in accordance with the Declaration of Helsinki and existing national ethics regulation.
: Not applicable.
: CT received honoraria for the participation to advisory boards or for oral presentations from: Allergan, ElectroCore, Eli-Lilly, Novartis, and Teva. CT has no ownership interest and does not own stocks of any pharmaceutical company. CT serves as Chief Section Editor of Frontiers in Neurology—Section Headache Medicine and Facial Pain and on the editorial board of The Journal of Headache and Pain. GS received honoraria for the participation to advisory boards or for oral presentations from: Eli-Lilly and Novartis. The remaining authors have no conflicts of interest.