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Al-Delaimy WK, Natarajan L, Sun X, Rock CL, Pierce JP, Pierce JJ; Women's Healthy Eating and Living (WHEL) Study Group. Reliability of plasma carotenoid biomarkers and its relation to study power. Epidemiology. 2008 Mar;19(2):338–44. PMID: 18300693; PMCID: PMC2574518. |