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		Critical appraisal of epidemiological studies and clinical trials. by Elwood, J. Mark. Edition: 2Material type: Text; Format: print ; Literary form: Not fiction Language: eng. Publication details: Oxford Oxford University Press, 1998Availability: Not available: WHO Library: Lost (1). Add to cart (remove)
		Critical appraisal of epidemiological studies and clinical trials. by Elwood, J. Mark. Edition: 3rdMaterial type: Text; Format: print ; Literary form: Not fiction Language: English Publication details: Oxford Oxford University Press, 2007Availability: Items available for loan: WHO Library (1)Call number: WA 950 2007CR. Place hold Add to cart (remove)

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