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	1.	The costs and benefits of preventing influenza in Ontario's elderly. [electronic resource] by Helliwell, B E Drummond, M F Producer: 19880920 In: Canadian journal of public health = Revue canadienne de sante publique vol. 79 Availability: No items available. Save to lists Add to cart (remove)
	2.	Underreporting of cancer in medical surveys: a source of systematic error in cancer research. [electronic resource] by Chambers, L W Spitzer, W O Hill, G B Helliwell, B E Producer: 19761002 In: American journal of epidemiology vol. 104 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	3.	The occupation of fishing as a risk factor in cancer of the lip. [electronic resource] by Spitzer, W O Hill, G B Chambers, L W Helliwell, B E Murphy, H B Producer: 19751021 In: The New England journal of medicine vol. 293 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)

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