Supplemental material for Non-invasive vagus nerve stimulation (nVNS) for the preventive treatment of episodic migraine: The multicentre, double-blind, randomised, sham-controlled PREMIUM trial

Supplemental Material for Non-invasive vagus nerve stimulation (nVNS) for the preventive treatment of episodic migraine: The multicentre, double-blind, randomised, sham-controlled PREMIUM trial by Hans-Christoph Diener, Peter J Goadsby, Messoud Ashina, Mohammad Al-Mahdi Al-Karagholi, Alexandra Sinclair, Dimos Mitsikostas, Delphine Magis, Patricia Pozo-Rosich, Pablo Irimia Sieira, Miguel JA Làinez, Charly Gaul, Nicholas Silver, Jan Hoffmann, Juana Marin, Eric Liebler, Michel D Ferrari and on behalf of the PREMIUM Study Group in Cephalalgia