scientific article
author: Stein Emil Vollset, Camilla Stoltenberg, Allen Wilcox, Preben Aavitsland, Hanne Nøkleby, Håkon K. Gjessing, Steinar Madsen, Per Magnus, Nina Gunnes, Lill Trogstad, Siri Eldevik Håberg, Per Nafstad, Anders Engeland, Kari Furu, Anders Skrondal, Inger Cappelen, Ingebjørg Buajordet, Berit Feiring
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