Almost invariably, a new baby's photo album begins with a grainy black-and-white picture taken months before birth - a prenatal ultrasound image, which is often detailed enough to inspire comments about the child's resemblance to various members of the family. But jokes about balding uncles notwithstanding, such scans serve a serious purpose and can prove immensely important, as when they allow doctors to diagnose and sometimes even repair a congenital malformation while the baby is still in the womb.
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Khuri-Yakub et al. (2009) studied this question.
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