32.Chung M, Balk EM, Brendel M, Ip S, Lau J, Lee J, Lichtenstein A, Patel K, Raman G, Tatsioni A, Terasawa T, Trikalinos TA. Vitamin D and calcium: a systematic review of health outcomes. Evid Rep Technol Assess (Full Rep). 2009 Aug;(183):1-420. http://www.ncbi.nlm.nih.gov/pubmed/20629479
33.Thompson IM Jr, Goodman PJ, Tangen CM, Parnes HL, Minasian LM, Godley PA, Lucia MS, Ford LG. Long-term survival of participants in the prostate cancer prevention trial. N Engl J Med. 2013 Aug 15;369(7):603-10. http://www.ncbi.nlm.nih.gov/pubmed/23944298