1. Department of Clinical Medicine and Surgery, Regional Reference Center for Coagulation Disorders, Federico II University Hospital, Naples, Italy
2. Regional Reference Centre for Inherited Bleeding Disorders, University Hospital, Parma, Italy
3. Clinical Chemistry Laboratory, Department of Pathology and Laboratory Medicine, University Hospital, Parma, Italy
4. Department of Hematology and Transfusion Medicine, C. Poma Hospital, Mantova, Italy