University of Pennsylvania, Philadelphia, Pennsylvania, U.S.A. Received August 2002; accepted November 2002. Address correspondence and reprint requests to Dr. Jonathan A. Drezner, Deptartment of Family Practice and Community Medicine, 51 North 39th Street/6 Mutch Building, Philadelphia, PA 19104, U.S.A. E-mail: [email protected]
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Jonathan A. Drezner (2003) studied this question.
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