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	1.	Causal Inference in Observational Studies in Surgery. [electronic resource] by Harrison, Ewen M OʼNeill, Stephen Wigmore, Stephen J Garden, O James Producer: 20150810 In: Annals of surgery vol. 262 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	Clinical utility of Doppler echocardiography in assessing aortic stenosis severity and predicting need for intervention in children. [electronic resource] by Vlahos, Antonios P Marx, Gerald R McElhinney, Doff Oneill, Stephen Goudevenos, Ioannis Colan, Steven D Producer: 20081113 In: Pediatric cardiology vol. 29 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)

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