GGTLC1 and biliary atresia: ALT: alanine transaminase, AST: aspartate transminase, GGT: gamma-glutamyl transpeptidase, INR: international normalized ratio, INH: idiopathic neonatal hepatitis, BA: biliary atresia, PFIC: progressive familial intrahepatic cholestasis, NISD: neonatal iron storage disease, CMV: cytomegalovirus.