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APA Citation
Clarke, R., Newman, C., Tomson, J., Hin, H., Kurien, R., Cox, J., Lay, M., Sayer, J., Hill, M., Emberson, J., & Armitage, J. (n.d.). estimation of the optimum dose of vitamin D for disease prevention in older people: Rationale, design and baseline characteristics of the BEST-D trial. Maturitas, 80(4), 426–431. http://access.bl.uk/ark:/81055/vdc_100026004662.0x00001d