Combined impact of healthy lifestyle factors on colorectal cancer: a large European cohort study - Aleksandrova, K; Pischon, T; Jenab, M; Bueno-de-Mesquita, HB; Fedirko, V; Norat, T; Romaguera, D; Knueppel, S; Boutron-Ruault, M-C; Dossus, L; Dartois, L; Kaaks, R; et al. (BMC Medicine, 2014)