Fitzgibbons SC, Ching Y, Yu D, Carpenter J, Kenny M, Weldon C, Lillehei C, Valim C, Horbar JD, Jaksic T. Mortality of necrotizing enterocolitis expressed by birth weight categories. Journal of Pediatric Surgery.2009;44(6): 1072-1075; discussion 1075-1076. PubMed: 19524719