1. Department of Clinical Epidemiology; Leiden University Medical Centre; Leiden The Netherlands
2. A. Bianchi Bonomi Haemophilia and Thrombosis Centre; Fondazione IRCCS Ca’ Granda - Ospedale Maggiore Policlinico; University of Milan; Milan Italy
3. Centre for Stroke research Berlin; Charité Universitätsmedizin Berlin; Berlin Germany
4. Brain Centre Rudolph Magnus; dept Neurology and Neurosurgery; University Medical Centre Utrecht; Utrecht the Netherlands
5. Julius Centre for Health Sciences and Primary Care; University Medical Centre Utrecht; Utrecht the Netherlands
6. Department of Thrombosis and Haemostasis; Leiden University Medical Centre; Leiden the Netherlands