1. Thrombosis and Hemostasis Unit, IRCCS Istituto Giannina Gaslini, 16147 Genoa, Italy
2. Center for Bleeding Disorders and Coagulation, Careggi University Hospital, 50134 Florence, Italy
3. FedEmo—Federazione delle Associazioni Emofilici, 20151 Milan, Italy
4. ABGEC—Associazione Bambini e Giovani con Emofilia e Altre Coagulopatie, 35128 Padua, Italy
5. Section of Medical Statistics, Department of Public Health and Infectious Disease, Sapienza Rome University, 00185 Rome, Italy
6. Center for Thrombosis and Hemorrhagic Diseases, IRCCS Humanitas Research Hospital, 20089 Rozzano, Italy
7. Faculty of Medicine, Humanitas University, 20072 Pieve Emanuele, Italy