1. Department of Clinical Laboratory Medicine, Sapporo Medical University School of Medicine, Japan
2. Department of Cardiovascular, Renal and Metabolic Medicine, Sapporo Medical University School of Medicine, Japan
3. Department of Gastroenterology, Rheumatology and Clinical Immunology, Sapporo Medical University School of Medicine, Japan
4. Division of Laboratory Diagnosis, Sapporo Medical University Hospital, Japan
5. Department of Public Health, Sapporo Medical University School of Medicine, Japan