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APA Citation
Xiang, F., Lucas, R., de Gruijl, F., & Norval, M. (n.d.). a systematic review of the influence of skin pigmentation on changes in the concentrations of vitamin D and 25-hydroxyvitamin D in plasma/serum following experimental UV irradiation. Photochemical & photobiological sciences, 14(12), 2138–2146. http://access.bl.uk/ark:/81055/vdc_100029725037.0x00005d