1. Department of Clinical Pathology, College of Medicine, the Catholic University of Korea, Uijongbu St. Mary’s Hospital, 65-1 Kumoh-Dong, Uijongbu-City, Kyunggi-Do 480-130, Korea
2. Department of Clinical Pathology, College of Medicine, the Catholic University of Korea, Kangnam St. Mary’s Hospital, 505 Banpo-dong Seocho-ku, Seoul 137-040, Korea