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A staged procedure was undertaken if the PNE testing was difficult in terms of foramen localization, if patients could not tolerate the procedure or if there was radiological evidence of electrode migration on the post-testing plain x-ray.
Goodrich believes the key to success in separating craniopagus twins is the staged procedure, which allows the twins' vascular system and veins to recover between each operation.
Then, the contributor's theoretical perspective is explained as well as a detailed staged procedure to implement the method.