The diagnostic value of the central vein sign in radiologically isolated syndrome oleh Cassandre Landes‐Chateau, Michael Levraut, Darin T. Okuda, Albert Themelin, Mikael Cohen, Orhun H. Kantarci, Aksel Siva, Daniel Pelletier, Lydiane Mondot, Christine Lebrun‐Frenay, on behalf RISConsortium