1. Rizzi DA. Medical prognosis — some fundamentals. Theor Med 1993;14:365–75
2. Stockler M, Boyd N, Tannock I. Guide to studies of diagnostic tests, prognostic factors, and treatments, in Tannock I, Hill R (eds.): The basic science of oncology (ed. 3rd). Toronto, McGraw-Hill, 1998, pp. 466–492
3. Byar DR Identification of prognostic factors, in Buyse ME, Staquet MJ, Sylvester RJ (eds.): Cancer Clinical Trials. New York, Oxford University Press, 1984, pp. 423–443
4. Yarbro JW, Page DL, Fielding LP, et al. American Joint Committee on Cancer prognostic factors consensus conference. Cancer 1999;86:2436–46
5. Burke HB, Henson DE. Criteria for prognostic factors and for an enhanced prognostic system. Cancer 1993;72:3131–3135