Single nucleotide polymorphic alleles in the 5′ region of the RET proto-oncogene define a risk haplotype in Hirschsprung's disease. Issue 9 (5th September 2003) - Sancandi, M; Griseri, P; Pesce, B; Patrone, G; Puppo, F; Lerone, M; Martucciello, G; Romeo, G; Ravazzolo, R; Devoto, M; Ceccherini, I