Safety of antithrombotic therapy in subjects with hereditary hemorrhagic telangiectasia: prospective data from a multidisciplinary working group oleh Eleonora Gaetani, Fabiana Agostini, Angelo Porfidia, Igor Giarretta, Daniela Feliciani, Luigi Di Martino, Annalisa Tortora, Antonio Gasbarrini, Roberto Pola, on behalf of the Multidisciplinary Gemelli Group for HHT