1 Division of Internal Medicine, Japan Agricultural Cooperatives Kochi Hospital, 526-1 Myoken-aza-Nakano, Nankoku, Kochi 783-8509, Japan.
2 Department of Urology, Kochi Medical School, Kochi University, 185-1, Oko-cho, Kohasu, Nankoku, Kochi, 783-8505, Japan.
3 Department of Diagnostic Pathology, Kochi University Hospital, 185-1, Oko-cho, Kohasu, Nankoku, Kochi, 783-8505, Japan.
4 Division of Internal Medicine, Japan Agricultural Cooperatives Kochi Hospital, 526-1 Myoken-aza-Nakano, Nankoku, Kochi 783-8509, Japan; Department of Community Medicine for Respirology, Graduate School of Biomedical Sciences, Tokushima University, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan. Electronic address: t-shinohara@kouseiren.ja-kochi.or.jp.