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Copy Talsma, Elise F; Verhoef, Hans; Brouwer, Inge D; Mburu-de Wagt, Anne S; Hulshof, Paul JM; Melse-Boonstra, Alida; (2015) Proxy markers of serum retinol concentration, used alone and in combination, to assess population vitamin A status in Kenyan children: a cross-sectional study. BMC medicine, 13 (1). 30-. ISSN 1741-7015 DOI: https://doi.org/10.1186/s12916-014-0256-5