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Handedness
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=== Ultrasound === Another theory is that [[Medical ultrasonography|ultrasound]] may sometimes affect the brains of unborn children, causing higher rates of left-handedness in children whose mothers receive ultrasound during pregnancy. Research suggests there may be a weak association between [[Obstetrical ultrasonography|ultrasound screening]] (sonography used to check the healthy development of the fetus and mother) and left-handedness.<ref name="Salvesen 2011">{{cite journal | vauthors = Salvesen KΓ | s2cid = 5135695 | title = Ultrasound in pregnancy and non-right handedness: meta-analysis of randomized trials | journal = Ultrasound in Obstetrics & Gynecology | volume = 38 | issue = 3 | pages = 267β71 | date = September 2011 | pmid = 21584892 | doi = 10.1002/uog.9055 | doi-access = free }}</ref>
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