Krueger, Gerald P, Bergoffen, Gene, Pickett, Racquel, Leaman, Howard M, Murray, Daniel, Transportation Research Board. "Results and Discussion of Medical Examiners Surveys." CTBSSP Synthesis 19: Effects of Psychoactive Chemicals on Commercial Driver Health and Performance: Stimulants, Hypnotics, Nutritional, and Other Supplements. Washington, DC: The National Academies Press, 2011.
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