hyperbilirubinemia benign bilirubin total congenital uln unless serum hereditary syndrome bilirubin gilberts mg dl total syndrome patients unless uln equal syndrome history gilberts patients stevens johnson known kostmann shwachman serotonergic gilberts bilirubin uln total syndrome disease patients unless documented subjects bilirubin origin rise hepatic gilberts syndrome unless non uln gilbert hemolysis gilberts bilirubin syndrome unless mg total dl hyperbilirubinemia normal gilberts bilirubin upper uln normal total limit syndrome unless disease