1. Department of Medical Genome Sciences, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan
2. Department of Gastroenterology and Hepatology, Sapporo Medical University School of Medicine, Sapporo, Japan
3. Department of Dermatology, Sapporo Medical University School of Medicine, Sapporo, Japan
4. Department of Urology, Sapporo Medical University School of Medicine, Sapporo, Japan
5. Keiwakai Nishioka Hospital, Sapporo, Japan
6. Biology, Department of Liberal Arts and Sciences Center for Medical Education, Sapporo Medical University, Sapporo, Japan