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Crissey S, Ange K, Slifka K, Bowen P, Stacewicz-Sapuntzakis M, Langman C, Sadler W, Ward A. Serum concentrations of vitamin D metabolites, vitamins A and E, and carotenoids in six canid and four ursid species at four zoos. Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology. 2001 Jan;128(1):155–65. doi: 10.1016/s1095-6433(00)00289-0. |