By Quartero A. O.   Numans M. E.   De Melker R. A.   Hoes A. W.   De Wit N. J.   in Scandinavian Journal of Gastroenterology

ISSN:0036-5521|36|9|942-947

Informa Healthcare‎(2001)‎

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By Numans M. E.   van der Graaf Y.   de Wit N. J.   de Melker R. A.   in Scandinavian Journal of Gastroenterology

ISSN:0036-5521|36|4|437-443

Informa Healthcare‎(2001)‎

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By Quartero A. O.   Numans M. E.   De Melker R. A.   De Wit N. J.   in British Journal of General Practice

ISSN:1478-5242|50|450|13-16

Royal College of General Practitioners‎(2000)‎

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