1. Department of Laboratory Medicine, Chungnam National University Hospital, Daejeon, Korea
2. Department of Laboratory Medicine, Ajou University School of Medicine, Suwon, Korea
3. Seoul Medical Science Institute, Yongin, Korea
4. Department of Laboratory Medicine, Korea University Guro Hospital, Seoul, Korea
5. The Division of Human Blood Safety Surveillance, Korea Centers for Disease Control and Prevention, Cheongju, Korea