1. Department of Laboratory Medicine, Severance Hospital, Seoul, Korea
2. Department of Biomedical Laboratory Science, Dankook University, Chungnam, Korea
3. Department of Laboratory Medicine, Kyung Hee University College of Medicine, Kyung Hee University Medical Center, Seoul, Korea
4. Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea