Environmental risk factors in paediatric inflammatory bowel diseases: a population based case control study
S Baron, D Turck, C Leplat, V Merle, C Gower-Rousseau, R Marti, T Yzet, E Lerebours, J-L Dupas, S Debeugny, J-L Salomez, A Cortot, and J-F Colombel
Gut. 2005 March; 54(3): 357–363. doi: 10.1136/gut.2004.054353.PMCID: PMC1774426