1. Department of Laboratory Medicine Tokyo Medical University Tokyo Japan
2. Department of Molecular Genetics of Coagulation Disorders Tokyo Medical University Tokyo Japan
3. Department of Pediatrics, St. Marianna University School of Medicine Yokohama City Seibu Hospital Yokohama Japan
4. Department of Transfusion Medicine Nagoya University Hospital Nagoya Japan
5. Department of Pediatrics University of Occupational and Environmental Health Kitakyushu Japan
6. Pfizer Japan Tokyo Japan