Department of Medicine McMaster Health Sciences, McMaster University, Hamilton, Ontario, Canada The Canadian Blood Service, Hamilton Center and the Department of Obstetrics and Gynecology, Monash University, Victoria, Australia Correspondence: J. G. Kelton, Room 3W10, McMaster Medical Centre, 1200 Main Street West, Hamilton, Ontario, Canada L8N 3Z5.
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Shehata et al. (1999) studied this question.
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