1 Departments of Medicine (Division of Dermatology) and Pediatrics, Georgetown University Medical Center and the Washington Institute of Dermatalagic Laser Surgery, Washington, DC. Address correspondence and reprint requests to: Tina S. Alster, MD, Washington Institute of Dermatologic Laser Surgery, 2311 M Street, NW, Suite 200, Washington, DC 20037.
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Alster et al. (1996) studied this question.