Hybrid training of voluntary and electrical muscle contractions reduces steatosis, insulin resistance, and IL-6 levels in patients with NAFLD: a pilot study - Kawaguchi, T; Shiba, N; Maeda, T; Matsugaki, T; Takano, Y; Itou, M; Sakata, M; Taniguchi, E; Nagata, K; Sata, M (J Gastroenterol, 2011)