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Research Article

Racial Differences in the Human Endogenous Circadian Period

  • Mark R. Smith,

    Affiliation: Biological Rhythms Research Laboratory, Department of Behavioral Sciences, Rush University Medical Center, Chicago, Illinois, United States of America

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  • Helen J. Burgess,

    Affiliation: Biological Rhythms Research Laboratory, Department of Behavioral Sciences, Rush University Medical Center, Chicago, Illinois, United States of America

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  • Louis F. Fogg,

    Affiliation: Biological Rhythms Research Laboratory, Department of Behavioral Sciences, Rush University Medical Center, Chicago, Illinois, United States of America

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  • Charmane I. Eastman mail

    ceastman@rush.edu

    Affiliation: Biological Rhythms Research Laboratory, Department of Behavioral Sciences, Rush University Medical Center, Chicago, Illinois, United States of America

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  • Published: June 30, 2009
  • DOI: 10.1371/journal.pone.0006014

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