. belfast sex slave: 'if i asked for food i was beaten, if i tried to sleep i was raped' .
lea ament, left, and tamara nunley talk about the care their team provided for helen and robert valenzuela at st. jude medical center in fullerton. (scott smeltzer / staff photographer).
.
it's the first successful medical treatment of a human fetus for the underlying cause of a genetic disorder, experts say..