4:
A longitudinal study of nonvitamin, nonmineral supplement use: prevalence, associations, and survival in an aging population.
Knudtson MD, Klein R, Lee KE, Reinke JO, Danforth LG, Wealti AM, Moore E, Klein BE.
Ann Epidemiol. 2007 Dec;17(12):933-9. Epub 2007 Sep 24.
PMID: 17890106 [PubMed - indexed for MEDLINE]
Related Articles Free article in PMC | at journal site