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Meta-analysis in total—lung cancer incidence depending on beta-carotene supplementation (legend: ATBC—Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study; PHS—Physicians’ Health Study; HPS—Heart Protection Study; WHS—Women’s Health Study; WACS—Women’s Antioxidant Cardiovascular Study; CARET (aw)—Carotene and Retinol Efficacy Trial, asbestos-workers; CARET (hs)—Carotene and Retinol Efficacy Trial, heavy smokers; LGPT—Linxian General Population Trial).
