Choosing cases and controls: the clinical epidemiology of "clinical investigation".

J Clin Invest

Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut 06510.

Published: January 1988

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC442465PMC
http://dx.doi.org/10.1172/JCI113279DOI Listing

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