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2. Cocaine use during pregnancy: prevalence and correlates;Frank;Pediatrics,1988
3. The reliability and consistency of self-reports on substance use in a longitudinal study;Barnea;Br J Addict,1987
4. Self-report issues in substance abuse: state of the art and future directions;Maisto;Behavioral Assessment,1990
5. Clinical evaluation and use of urine screening for drug abuse;Saxon;West J Med,1988