DOI: 10.1055/s-00000094

Zeitschrift für Gastroenterologie

References

Talley NJ, Holtmann G, Agreus L, Jones M.
Gastrointestinal symptoms and subjects cluster into distinct upper and lower groups in the community: A four nations study. 
Am J Gastroenterol 2000; 95: 1439-1447  

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