Changes of Urinary 8-Hydroxydeoxyguanosine Levels during a Two-Day Ultramarathon Race Period in Japanese Non-Professional Runners - Miyata, M; Kasai, H; Kawai, K; Yamada, N; Tokudome, M; Ichikawa, H; Goto, C; Tokudome, Y; Kuriki, K; Hoshino, H; Shibata, K; Suzuki, S; Kobayashi, M; Goto, H; Ikeda, M; Otsuka, T; Tokudome, S (International Journal of Sports Medicine, 2008)