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  • Gustavsen, Marte Wendel; Page, Christian; Moen, Stine Marit; Bjølgerud, Anja; Berg-Hansen, Pål; Nygaard, Gro Owren; Sandvik, Leiv; Lie, Benedicte Alexandra; Celius, Elisabeth Gulowsen; Harbo, Hanne Flinstad (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    Background: Several environmental exposures, including infection with Epstein-Barr virus, low levels of vitamin D and smoking are established risk factors for multiple sclerosis (MS). Also, high hygienic standard and ...