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IP address: 3.236.219.157
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URL: http://scholar.google.com/scholar_lookup?title=Statistical+analysis+and+interpretation+of+prenatal+diagnostic+imaging+studies%2C+part+3%3A+approach+to+study+design&year=2011&author=Goetzinger&journal=J+Ultrasound+Med&volume=30&issue=10&pages=1415-1423&doi=10.7863%2Fjum.2011.30.10.1415&pmid=21968494