1. Center for Environmental and Health Sciences, Hokkaido University, Sapporo, Japan
2. Department of Public Health, Hokkaido University Graduate School of Medicine, Sapporo, Japan
3. Department of Urology, Hokkaido University Hospital, Sapporo, Hokkaido, Japan
4. Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Hoshi University, Tokyo, Japan
5. Department of Renal and Genitourinary Surgery, Graduate School of Medicine, Hokkaido University, Sapporo, Hokkaido, Japan
6. Kushiro Rosai Hospital, Kushiro, Japan