NOD2 and Crohn disease: 24 Arnott Arnott I.D I.D Nimmo Nimmo ER ER Drummond Drummond HE HE Fennell Fennell J J Smith Smith BR BR MacKinlay MacKinlay E E Morecroft Morecroft J J Anderson Anderson N N Kelleher Kelleher D D O'Sullivan O'Sullivan M M McManus McManus R R Satsangi Satsangi J J NOD2/CARD15, TLR4 and CD14 mutations in Scottish and Irish Crohn's disease patients: evidence for genetic heterogeneity within Europe?