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nih.gov
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Verspohl, Eugen J. et al.; Bauer, K; Neddermann, E (2005). «Antidiabetic effect of Cinnamomum cassia and Cinnamomum zeylanicum In vivo and In vitro». Phytotherapy Research19 (3): 203-206. PMID15934022. doi:10.1002/ptr.1643.|fechaacceso= requiere |url= (ayuda)