ForonesN.M., TanakaM., MatosD.Relationship between mesenteric and peripheral blood levels of CA 19-9 in patients with colorectal cancer. Int J Biol Markers2001; 16: 27–30.
2.
StatXact 4 for Windows: Statistical software for exact non parametric inference.Cambridge: CYTEL Software Corporation, 1998.
3.
Tschuproq. In: YouleG.V., KendallM.G., eds. An introduction to the theory of statistics, 4th edition.London: Charles Griffin and G. Limited, 1965; 53–5.
4.
FleissJ.L.Statistical methods for rates and proportions, 2nd edition.New York: John Wiley and Sons, 1981.