Angelo Bianchi Bonomi Hemophilia and Thrombosis Center and Fondazione Luigi Villa, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy. Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Milan, Italy. Division of Hematology, Department of Internal Medicine, The Ohio State University, Columbus, OH. Department of Haematology, University College London Hospital National Health Service Trust, London, United Kingdom. Department of Hematology, Reference Center for Thrombotic Microangiopathies, Saint-Antoine University Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France. Department of Medicine 1, Division of Hematology and Hemostasis, Medical University of Vienna, Vienna, Austria. Department of Hematology and Central Hematology Laboratory, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland. Department of Medicine, Duke University School of Medicine, Durham, NC. Hematology Department, Internal Medicine, School of Medicine and Dentistry, Catholic University of Valencia and Hospital Doctor Peset, Valencia, Spain. Departments of Laboratory Medicine and Medicine, St. Michael's Hospital, Toronto, Canada. Departments of Laboratory Medicine and Pathobiology and Medicine, University of Toronto, Toronto, Canada. Clinical Development, Ablynx, a Sanofi company, Ghent, Belgium; and. Medical Affairs, Sanofi, Diegem, Belgium.