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Free University Hospital Amsterdam, The Netherlands Correspondence: Gustaaf A. Dekker, MD, PhD. Chef de Clinique. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Free University Hospital, Room V 328, 1081 HV Amsterdam, The Netherlands 020-5489111 tracer 81 104.
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Zeeman et al. (1992) studied this question.
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