From the Division of Newborn Services, the Royal Women's Hospital, Carlton (SM, LWD), and the Departments of Obstetrics and Gynaecology (SM, LWD) and Paediatrics (LWD), The University of Melbourne, Parkville, Australia. Accepted for publication June 7, 2000. Reprints not available.
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Mehr et al. (2000) studied this question.
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