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APA Citation
Xu, X., Rao, Y., Sharma, M., Guo, J. J., & Zhao, Y. (n.d.). behaviours in avoiding indoor exposure to second-hand smoke among pregnant women in five geographical areas of China: a cross-sectional study. Lancet, 388, S98–. http://access.bl.uk/ark:/81055/vdc_100038840277.0x00001d