6Engum SA, Grosfeld JL, West KW, et al. Analysis of morbidity and mortality in 227 cases of esophageal atresia and/or tracheoe- sophageal fistula over two decades[J]. Arch Surg, 1995,130 (5) : 502-508.
7Harris J, Kallen B, Robert E. Descriptive epidemiology of alimen- tary tract atresia[J]. Teratology, 2006,52( 1 ) : 15-29.
8Ioannides AS, Henderson D J, Spitz L, et al. Role of Sonic hedge- hog in the development of the trachea and oesophagus[J]. J Pedi- atr Surg, 2003,38 ( 1 ) : 29-36.
9Litingtung Y, Lei L, Westphal H, et al. Sonic hedgehog is essen- tial to foregut Development[J]. Nat Genet, 1998,20 (1) :58-61.
10KimPC ,Mo R, Hui CC. Murine models of VACTERL syndrome: Role of sonic hedgehog signaling pathway[J]. J Pediatr Surg, 2001, 36(2) :381-384.