1[1]Ritenbaugh C, Streit K, Helfand M. Routine vitamin supplementation to prevent cancer: A summary of the evidence from Randomized controlled trials for the USPSTF[EB/OL].http://www.ahrq.gov/clinic/3rduspstf/witamins/vitasum.pdf, 2003-06/2003-11
2[2]Morris CD, Carson S. Routine vitamin supplementation to prevent cardiovascular disease:A summary of the evidence for the USPSTF[EB/OL].http://www.ahrq.gov/clinic/3rduspstf/witamins/vitasum.pdf, 2003-06/2003-11
3[3]Atkins D, Shetty P. Routine vitamin supplementation to prevent cancer: Update of the evidence from Randomized controlled trials 1999-2002[EB/OL].http://www.ahrq.gov/clinic/3rduspstf/witamins/vitasum.pdf, 2003-06/2003-11
4[4]UAPSTF. Routine vitamin supplementation to prevent cancer and cardiovascular disease--Recommendations and rationals[J]. Ann Intern Med, 2003,139:51-55