scientific article published on 4 December 2013
author: Maja-Lisa Løchen, Inger Njølstad, Ellisiv Mathiesen, Marit D Solbu, Ingrid Toft, Bjørn Odvar Eriksen, Toralf Melsom, Trond Jenssen, Therese von Hanno, Geir Bertelsen, Marit Herder, Ulla D Mathisen
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