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APA Citation
Graeff-Armas, L. A., Bendik, I., Kunz, I., Schoop, R., Hull, S., & Beck, M. (2020). supplemental 25-Hydroxycholecalciferol Is More Effective than Cholecalciferol in Raising Serum 25-Hydroxyvitamin D Concentrations in Older Adults. Journal of nutrition, 150(1), 73–81. http://access.bl.uk/ark:/81055/vdc_100128200788.0x000060