1. Amman RW, Tagwercher E, Kashiwagi H, Rosenmund H. Diagnostic value of faecal chymotrypsin and trypsin assessment for detection of pancreatic disease. Am J Dig Dis 1968;13:123–146.
2. Ehrhard-Schmelzer S, Otto J, Schlager R, Lankisch PG. Faecal chymotrypsin for investigation of exocrine pancreatic function: a comparison of two newly developed tests with the titrimetric method. Z Gastroenterol 1984;22:647–651.
3. Ammann RW, Bühler H, Pei P. Comparative diagnostic accuracy of four tubeless pancreatic function tests in chronic pancreatitis. Scand J Gastroenterol 1982;17:997–1002.
4. Muller L, Wisniewski ZS, Hansky J. The measurement of faecal chymotrypsin: a screening test for pancreatic exocrine insufficiency. Aust Ann Med 1970;19:47–49.
5. Sale JK, Goldberg DH, Thjodliefsson B, Wormsley KG. Trypsin and chymotrypsin in duodenal aspirate and faeces in response to secretin and cholecystokinin. Gut 1974;15:132–138.