Central Baptist Hospital, Lexington, Kentucky and University of Louisville, Louisville, Kentucky* University of Texas Medical Branch at Galveston, Galveston, Texas † University of Tennessee, Memphis, Tennessee ‡ Correspondence: John Robert Barton, MD, Director, Antenatal Diagnostics, Central Baptist Hospital, Central Women’s Specialty Center, 1740 Nicholasville Road, Lexington, KY 40503.
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Barton et al. (1999) studied this question.
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