Contribution of the NOD1/CARD4 insertion/deletion polymorphism +32656 to inflammatory bowel disease in Northern Europe by Van Limbergen, J, Russell, RK, Nimmo, ER, Törkvist, L, Lees, CW, Drummond, HE, Smith, L, Anderson, NH, Gillett, PM, McGrogan, P, Hassan, K, Weaver, LT, Bisset, WM, Mahdi, G, Arnott, ID, Sjöqvist, U, Lördal, M, Farrington, SM, Dunlop, MG, Wilson, DC, Satsangi, J