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APA Citation
Feng, Z., Yang, J., Xu, M., Lin, R., Yang, H., Lai, L., Wang, Y., Wahner-Roedler, D. L., Zhou, X., Shin, K., Salinas, M., Mallory, M. J., Tang, C., Patchett, D. C., Bauer, B. A., & Cui, S. (2021). dietary supplements and herbal medicine for COVID-19: A systematic review of randomized control trials. Clinical nutrition ESPEN, 44, 50–60. http://access.bl.uk/ark:/81055/vdc_100136723129.0x00000f