1. Department of Clinical Laboratory Toyama Prefectural Central Hospital Toyama Japan
2. Department of Hematology Toyama Prefectural Central Hospital Toyama Japan
3. Department of Molecular Patho‐Biochemistry and Patho‐Biology Yamagata University School of Medicine Yamagata Japan
4. Japanese Collaborative Research Group on Autoimmune Coagulation Factor Deficiencies (JCRG) Yamagata Japan
5. Department of Clinical Laboratory Medicine Yamagata University School of Medicine Yamagata Japan