원저 : 간내 담석증 수술시 술중초음파 검사의 유용성에 관한 연구 ( Original Article : A Study About Usefulness of Intraoperative Ultrasonogram on Operation of Intrahepatic Stones )
= ( Original Article : A Study About Usefulness of Intraoperative Ultrasonogram on Operation of Intrahepatic Stones )