1. Central Laboratories, Qingdao Municipal Hospital, Qingdao, Shandong 266000, P.R. China
2. Medical Examination Center, Qingdao Municipal Hospital, Qingdao, Shandong 266000, P.R. China
3. Department of Hepatobiliary Surgery, Qingdao Municipal Hospital, Qingdao, Shandong 266000, P.R. China