Randomized Cross Over Study Assessing the Efficacy of Non-invasive Stimulation of the Vagus Nerve in Patients With Axial Spondyloarthritis Resistant to Biotherapies: The ESNV-SPA Study Protocol.. Azabou, E; Bao, G; Costantino, F; Jacota, M; Lazizi, C; Nkam, L; Rottman, M; Roux, A L; Chevallier, S; Grimaldi, L; Breban, M. Front Hum Neurosci. 2021; 15: p.679775-679775. doi:10.3389/fnhum.2021.679775Article