1. Department of Laboratory Medicine, Chung-Ang University College of Medicine, Seoul, Korea.
2. Department of Pathology, Chung-Ang University College of Medicine, Seoul, Korea.
3. Cardiovascular-Arrhythmia Center, Chung-Ang University College of Medicine, Seoul, Korea.
4. Department of Urology, Chung-Ang University College of Medicine, Seoul, Korea.