1 Department of Medicine and Geriatrics, Kochi Medical School, Kochi University, Kohasu, Oko-cho, Nankoku, Kochi, 783-8505, Japan. matsumur@kochi-u.ac.jp.
2 Department of Medicine and Geriatrics, Kochi Medical School, Kochi University, Kohasu, Oko-cho, Nankoku, Kochi, 783-8505, Japan.
3 Department of Laboratory Medicine, Kochi Medical School, Kochi University, Kochi, Japan.
4 First Department of Internal Medicine, Kochi Medical School, Kochi University, Kochi, Japan.