1. Faculty of Health Sciences; University of the Witwatersrand and National Health Laboratory Service; Charlotte Maxeke Johannesburg Academic Hospital; Johannesburg South Africa
2. Children's Hospital Los Angeles; University of Southern California Keck School of Medicine; Los Angeles CA USA
3. Haemostasis and Thrombosis Unit; Division of Haematology; Cliniques universitaires Saint-Luc; Brussels Belgium
4. Pediatric Thrombosis and Hemostasis Program; Division of Hematology/Oncology; Hospital for Sick Children; University of Toronto; Toronto ON Canada
5. Centre for Thrombosis and Haemostasis; Lund University; Malmö Sweden
6. A. Bianchi Bonomi Hemophilia and Thrombosis Center; IRCCS Ca' Granda Foundation; Maggiore Hospital Policlinico of Milan; Milan Italy