esophageal atresia causespathophysiology of esophageal atresiaesophageal atresia managementesophageal atresia repairesophageal and intestinal atresiaesophageal atresia operationesophageal atresia diagnosisesophageal atresia prognosisisolated esophageal atresiaproximal esophageal atresiadefine esophageal atresianeonatal esophageal atresia