By Velden Alike   Wit Niek   Quartero A. Otto   Grobbee Diederick   Numans Mattijs   in Scandinavian Journal of Gastroenterology

ISSN:0036-5521|44|3|380-382

Informa Healthcare‎(2009)‎

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By Grobbee Diederick   Hoes Arno   Verheij Theo   Schrijvers Augustinus   Ameijden Erik   Numans Mattijs   in European Journal of Epidemiology

ISSN:0393-2990|20|3|285-290

Springer Publishing Company ‎(2005)‎

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