University of Southern California, Los Angeles, CA, University of California, Los Angeles, Los Angeles, CA Address correspondence and reprint requests to: David M. Duffy, MD, 4201 Torrance Blvd., Suite 710, Torrance, CA 90503-4510. D. M. DUFFY, MD HAS INDICATED NO SIGNIFICANT INTEREST WITH COMMERCIAL SUPPORTERS.
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David M. Duffy (2002) studied this question.
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