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A prospective, comparative study of the para-aminobenzoic acid test and faecal elastase 1 in the assessment of exocrine pancreatic functionSONWALKAR, S. A; HOLBROOK, I. B; PHILLIPS, I et al.Alimentary pharmacology & therapeutics. 2003, Vol 17, Num 3, pp 467-471, issn 0269-2813, 5 p.Article