The validity and accuracy of the Work Productivity and Activity Impairment questionnaire – irritable bowel syndrome version (WPAI:IBS)

Reilly, M. C. ; Bracco, A. ; Ricci, J.‐F. ; Santoro, J. ; Stevens, T.

Alimentary pharmacology & therapeutics, 2004-08, Vol.20 (4), p.459-467 [Periódico revisado por pares]

Oxford, UK: Blackwell Science Ltd

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