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- The domestic/international gastroenterology surveillance study (DIGEST): an international comparative study of the prevalence and impact of gastrointestinal symptoms / guest editor Vincenzo Stanghellini . 1999. Vol. 34, Suppl. 231 - Oslo : Scandinavian University Press , 1999 - 54 s. (Scandinavian Journal of Gastroenterology; Suppl. 231) [1, currently available 0, at library only 1]
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