1. College of Medical Technology, Hokkaido University, North-12, West-5, Sapporo 060-0812, Japan
2. Departments of Laboratory Medicine and
3. Pediatrics, Hokkaido University School of Medicine, North-14, West-5, Sapporo 060-8648, Japan
4. Department of Laboratory Medicine, Kyorin University School of Medicine, 6-20-2, Shinkawa, Mitaka-shi, Tokyo 181-8611, Japan