By Van Blankenstein Mark   Looman Caspar   Kruijshaar Michelle   Siersema Peter   Kuipers Ernst   Bytzer Peter   in Scandinavian Journal of Gastroenterology

ISSN:0036-5521|42|3|308-317

Informa Healthcare‎(2007)‎

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By Kruijshaar Michelle Elisabeth   Barendregt Jan   Vos Theo   de Graaf Ron   Spijker Jan   Andrews Gavin   in European Journal of Epidemiology

ISSN:0393-2990|20|1|103-111

Springer Publishing Company ‎(2005)‎

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