1. Department of Haematology , Institute of Clinical Pathology and Medical Research (ICPMR), NSW Health Pathology, Westmead Hospital , Westmead, NSW 2145 , Australia
2. Sydney Centres for Thrombosis and Haemostasis , Westmead, NSW , Australia , Phone: +(612) 8890 6618, Fax: +(612) 9689 2331
3. UC Davis Health System, Hemophilia Treatment Center , Sacramento, CA , USA
4. Department of Pathology and Laboratory Medicine , University of Texas Health Science Center , San Antonio, TX , USA
5. UK NEQAS (Blood Coagulation) , Sheffield , UK
6. Section of Clinical Biochemistry, Department of Neurological , Biomedical and Movement Sciences, University of Verona , Verona , Italy