Cumulative comorbid conditions influence mortality risk after staged palliation for hypoplastic left heart syndrome and variants.

Backes ER, Afonso NS, Guffey D, Tweddell JS, Tabbutt S, Rudd NA, O'Harrow G, Molossi S, Hoffman GM, Hill G, Heinle JS, Bhat P, Anderson JB, Ghanayem NS