PiantadosiS. Clinical trials: A methodologic perspective, 2nd ed. Wiley Series in Probability & Statistics. New Jersey: John Wiley and Sons, Inc., 2005.
2.
Food and Drug Administration. International Conference on Harmonization; guidance on statistical prinicples for clinical trials; availability. Available at: www.fda.gov/downloads/RegulatoryInformation/Guidances/UCM129505.pdf Accessed February10, 2014.
3.
JacksonRD, LaCroixAZ, GassM, et al. Calcium plus vitamin D supplementation and the risk of fractures. N Engl J Med, 2006; 354:669–683.
