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How does this differ from Dr. Cowans study published in the new England Journal of Medicine?

April 26, 2017cowan differ Dr Medicine New England published study

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How does this differ from Dr. Cowans study published in the new England Journal of Medicine?

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A. Dr. Cowan et. al. compared overall and selected birth defects but not specific or rare syndromes. Further, the data used in his study does not enable one to distinguish Goldenhar syndrome from other problems in the development of head and face.