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Excerpt from the National Institutes of Health Consensus Development Conference Statement - 1984 - http://www.ob-ultrasound.net/joewoo3y.html

Lack of risk has been assumed because no adverse effects have been demonstrated clearly in humans. However, other evidence dictates that a hypothetical risk must be presumed with ultrasound. Like-wise, the efficacy of many uses of ultrasound in impr

Ultrasound Safety references - http://www.ob-ultrasound.net/joewoo3x.html

part of a comprehensive guide to Obstetric ultrasound (Joseph Woo)