Bérangère S. Joly, Pascale Loiseau, Michael Darmon, Thierry Leblanc, Hervé Chambost, Fanny Fouyssac, Vincent Guigonis, Jérôme Harambat, Alain Stepanian, Paul Coppo, Agnès Veyradier. HLA-DRB1*11 is a strong risk factor for acquired thrombotic thrombocytopenic purpura in children. Haematologica 2020;105(10):e531; https://doi.org/10.3324/haematol.2019.241968.