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Additional file 4: Video S4. The balloon is punctured under ultrasound guidance using a 20–22 G needle. The needle is inserted as close as possible to the anterior shoulder, which enables to pass the umbilical cord which is lying on the neck. As the balloon is punctured, the trachea can be seen collapsing. Copyright: UZ Leuven, Leuven, Belgium. (MP4 5472 kb)
