“…[26][27][28][29] Relationships between hospital or surgeon operative volume and outcomes in neonatal and pediatric surgery have been reported in several studies examining surgical repair of biliary atresia (BA), craniosynostosis, cleft lip, congenital diaphragmatic hernia (CDH), gastroschisis, pyloric stenosis, and thyroidectomy. [30][31][32][33][34][35][36][37][38][39][40] However, other studies of these same procedures, namely surgical repair of BA, CDH, and gastroschisis, and a recent study examining repair of esophageal atresia/tracheoesophageal fistula (EA/TEF), have failed to show such a relationship. 32,[40][41][42][43][44][45][46][47] Outcomes after Hirschsprungs PT may depend on surgical and pathological expertise, as well as perioperative care, and therefore, may be related to surgeon or hospital experience.…”