NOD2 and Crohn disease: 30 Heliö Heliö T T Halme Halme L L Lappalainen Lappalainen M M Fodstad Fodstad H H Paavola-Sakki Paavola-Sakki P P Turunen Turunen U U Färkkilä Färkkilä M M Krusius Krusius T T Kontula Kontula K K CARD15/NOD2 gene variants are associated with familially occurring and complicated forms of Crohn's disease CARD15/NOD2 gene variants are associated with familially occurring and complicated forms of Crohn's disease Gut.