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Flowchart summarizing recruitment of patients eligible for fetal open spina bifida (OSB) surgery, and acquisition, reconstruction and segmentation of magnetic resonance imaging (MRI) scans at three timepoints (approximately 1 week before, 1 week after and 6 weeks after surgery). If patient had more than three scans, highest‐quality reconstruction was used for each of three timepoints. FMU, fetal medicine unit; FSC, fetal surgery center.
