1. Haemostasis and Thrombosis Centre Cremona Hospital Cremona Italy
2. ECAT Foundation (External Quality Control for Assays and Tests) Voorschoten The Netherlands
3. Haematology Laboratory AP‐HP, Hôpital Universitaire Necker‐Enfants Malades Paris France
4. CHU UCL NAMUR, Namur Thrombosis and Hemostasis Center (NTHC) Université Catholique de Louvain Yvoir Belgium