Department of Gastroenterology, Oslo University Hospital Aker and φstfold Hospital Trust, 1603 Fredrikstad, Norway
Department of Research, Telemark Hospital Trust, 3710 Skien, Norway
Department of Gastroenterology, φstfold Hospital Trust, 1603 Fredrikstad, Norway
Department of Gastroenterology, Innlandet Hospital Trust, 2380 Brummundal, Norway
Department of Gastroenterology, Oslo University Hospital and Institute of Clinical Medicine, University of Oslo, 0586 Oslo, Norway
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