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APA Citation
Jonas, J. B., Wu, S. L., Wang, Y. X., Xiulan, Z., Ma, K., Zhang, W., Xu, L., Chen, S. H., Panda-Jonas, S., & Wei, W. B. (n.d.). diabetic retinopathy in China: population-based studies and clinical and experimental investigations. Lancet, 390, S30–. http://access.bl.uk/ark:/81055/vdc_100054503089.0x000054