1 Department of Data Science, Hyogo Medical University, Nishinomiya, Hyogo 663-8501, Japan. Electronic address: morimoto@kuhp.kyoto-u.ac.jp.
2 Department of Data Science, Hyogo Medical University, Nishinomiya, Hyogo 663-8501, Japan; Department of Neurosurgery, Hyogo Medical University, Nishinomiya, Hyogo 663-8501, Japan.