1. Department of Pathology, Chemon Co., Ltd., 240 Nampyeongro, Yangji-Myeon, Cheoin-Gu, Yongin-Si, Gyeonggi-Do 449-826, Republic of Korea
2. Department of Pathology, Kyungpook National University Medical Center, 474 Hakjeongdong, Buk-gu, Daegu 702-210, Republic of Korea
3. Department of Biomedical Laboratory Science, Namseoul University, Cheonan, Chungcheongnam-do 331-707, Republic of Korea