Dr. Barth Green, chairman of the department of neurological surgery at the University of Miami school of medicine and consultant to Everett's doctors, says this is the first time he's heard of a doctor starting this procedure within moments of an injury a critical move that should greatly increase Everett's chances of regaining full mobility.

NPR: Outlook for Everett Optimistic, Doctor Says

Friedman said Kennedy was awake during the surgery and would experience no permanent neurological effects from the surgery.

NPR: Doctors: Kennedy Brain Surgery a Success

So far, the girls are reacting in the same ways to tests and stimuli as they did prior to surgery which suggests they have not suffered neurological side effects.

BBC: Conjoined twins separated by Great Ormond Street doctors