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3. Clinical applications of '3C02 measurements;Klein, P.D.;Federation Proceedings,1982
4. Minimum analysis requirements for the detection of Helicobacter pylori infection by the 13C-urea breath test;Klein, P.D.; Graham, D.Y.;Am J Gastroenterol,1993
5. The Sydney system: histological division;Price, A.B.;Y Gastroenterol Hepatol,1991