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Investigators at multiple institutions conducted a retrospective cohort study to compare overall survival among children with biliary atresia (BA) whose initial treatment was biliary-enteric drainage (BED) or primary liver transplant (PLT). Patients with BA between 1990 and 2015 were identified using ICD-9 diagnosis codes obtained from the California Office of Statewide Health Planning and Development, which collects admission and discharge dates, patient demographics, diagnoses, and procedure codes from >6,000 health care facilities licensed by the California Department of Public Health, including 450 hospitals. Patients without any documented operative intervention by 5 years of age were excluded. Identified patient files were then linked to the Death Statistical Master File maintained by the California Department of Public Health.
The primary predictor variable was the type of …
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