1. From the Departments of Vascular Medicine (FL and HRB) and Clinical Epidemiology, Biostatistics, and Bioinformatics (RCP, PMB, and TJR), Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands; the Unit of Hematology and Thrombosis, Department of Medicine, Surgery, and Dentistry, Ospedale San Paolo, University of Milano, Milano, Italy (FL); the Department of Gynaecology and O