1. Liver and Immunology Research Center, Daejeon Oriental Hospital of Daejeon University, 176-9 Daeheung-ro, Jung-gu, Daejeon 302-724, Republic of Korea
2. Department of Health Service Management, Daejeon University, 62 Daehak-ro Yongun-dong, Song-gu, Daejeon 300-716, Republic of Korea