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Crowther, J. S., B. S. Drasar, M. J. Hill, R. Maclennan, D. Magnin, S. Peach, và C. H. Teoh-chan. Faecal Steroids and Bacteria and Large Bowel Cancer in Hong Kong By Socio-economic Groups. Nature Publishing Group, 1976.

Crowther, J. S., et al. Faecal Steroids and Bacteria and Large Bowel Cancer in Hong Kong By Socio-economic Groups. Nature Publishing Group, 1976.