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Digestive Diseases and Sciences > 2018 > 63 > 7 > 1929-1936
European Journal of Epidemiology > 2003 > 18 > 9 > 879-882
Digestive Diseases and Sciences > 2018 > 63 > 7 > 1929-1936
European Journal of Epidemiology > 2003 > 18 > 9 > 879-882