Relapse of thrombotic thrombocytopenic purpura after COVID-19 vaccine - Sissa, Cinzia; Al-Khaffaf, Ahmad; Frattini, Francesco; Gaiardoni, Roberta; Mimiola, Elda; Montorsi, Paolo; Melara, Barbara; Amato, Massimo; Peyvandi, Flora; Franchini, Massimo (Transfusion and apheresis science, 2021)