Exploring geographical differences in the incidence of colorectal cancer in the Norwegian Women and Cancer Study: a population-based prospective study by Oyeyemi SO, Braaten T, Botteri E, Berstad P, Borch KB

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Changes in lifestyle and risk of colorectal cancer in the European Prospective Investigation into Cancer and Nutrition by Botteri, E, Peveri, G, Berstad, P, Perez-Cornago, A, Ferrari, P

Dietary sources of vitamin B-12 and their association with plasma vitamin B-12 concentrations in the general population: the Hordaland Homocysteine Study. by Vogiatzoglou, A, Smith, A, Nurk, E, Berstad, P, Drevon, C, Ueland, P, Vollset, SE, Tell, G, Refsum, H