MRNA COVID-19 vaccines do not increase the short-term risk of clinical relapses in multiple sclerosis. Issue 4 (18th August 2021) - Di Filippo, Massimiliano; Cordioli, Cinzia; Malucchi, Simona; Annovazzi, Pietro; Cavalla, Paola; Torri Clerici, Valentina; Ragonese, Paolo; Nociti, Viviana; Radaelli, Marta; Laroni, Alice; Buttari, Fabio; Lorefice, Lorena; et al.