Eero Pukkala, Prof., Jan Ivar Martinsen, Elsebeth Lynge, Holmfridur Kolbrun Gunnarsdottir, Pär Sparén, Laufey Tryggvadottir, Elisabete Weiderpass, and Kristina Kjaerheim. 2009. “Occupation and Cancer – Follow-up of 15 Million People in Five Nordic Countries”. Acta Oncologica 48 (5):646-790. https://doi.org/10.1080/02841860902913546.