1. Graduate School of Health Sciences, Hokkaido University, Kita‐12, Nishi‐5, Kita‐ku, Sapporo, Hokkaido 060‐0812, Japan
2. Laboratory of Advanced Data Science, Information Initiative Center, Hokkaido University, Kita‐11, Nishi‐5, Kita‐ku, Sapporo, Hokkaido 060‐0811, Japan
3. Department of Radiation Medicine, Graduate School of Medicine, Hokkaido University, Kita‐15, Nishi‐5, Kita‐ku, Sapporo, Hokkaido 060‐8638, Japan
4. Faculty of Health Sciences, Hokkaido University, Kita‐12, Nishi‐5, Kita‐ku, Sapporo, Hokkaido 060‐0812, Japan