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(en) Bidulescu A, Chambless LE, Siega-Riz AM, Zeisel SH, Heiss G, «Repeatability and measurement error in the assessment of choline and betaine dietary intake: the Atherosclerosis Risk in Communities (ARIC) study», Nutrition Journal, vol.8, no1, , p.14 (PMID19232103, PMCID2654540, DOI10.1186/1475-2891-8-14)