Invited commentary: hypothetical interventions to define causal effects--afterthought or prerequisite?
Am J Epidemiol. 2005 Oct 1;162(7):618-20; discussion 621-2. doi: 10.1093/aje/kwi255. Epub 2005 Aug 24.
Am J Epidemiol. 2005.
PMID: 16120710
No abstract available.