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