Tennenbaum Center for the Biology of Creativity, University of California, Los Angeles, CA 90095, USA
Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, CA 90095, USA
Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
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Article history:
Received 15 July 2009
Received in revised