1. Japanese Workshop for Standardization of Antiphospholipid Antibodies Ishikari‐Tobetsu Japan
2. Department of Laboratory Science Faculty of Health Science Yamaguchi University Graduate School of Medicine Ube Japan
3. Health Sciences University of Hokkaido Dental Clinic Ishikari‐Tobetsu Japan
4. Department of Rheumatology and Infectious Diseases Kitasato University Sagamihara Japan
5. Department of Clinical Laboratory Science Division of Health Sciences Kanazawa University Graduate School of Medicine Kanazawa Japan
6. Department of Hematology/Clinical Laboratory Iwate Prefectural Chubu Hospital Kitakami Japan