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Dr P Autier, International Agency for Research on Cancer, Lyon, France; email@example.com
what is the effect of vitamin D supplementation on all-cause mortality?
PubMed, ISI Web of Science (Science Citation Index Expanded), EMBASE/Excerpta Medica, Cochrane Library, and bibliographies of selected studies, reviews, or books (to November 2006).
Study selection and assessment:
principal published reports of randomised controlled trials (RCTs) that assessed the effects of vitamin D supplementation (vitamin D2 [ergocalciferol] or vitamin D3 [cholecalciferol]), taken for any condition, on all-cause mortality. Trials had to randomise participants on an individual (rather than cluster) basis and include sufficient information to allow for calculation of relative risks and 95% CIs for all-cause mortality for vitamin D supplementation v placebo or control. …
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