PMID: 12658038
Walkowiak J, Nousia-Arvanitakis S, Agguridaki C, Fotoulaki M, Strzykala K, Balassopoulou A, Witt M, Herzig KHLongitudinal follow-up of exocrine pancreatic function in pancreatic sufficient cystic fibrosis patients using the fecal elastase-1 test.
J Pediatr Gastroenterol Nutr. 2003 Apr;36(4):474-8., [PubMed]