1. Department of Laboratory Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Laboratory Medicine, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
3. Research Institute, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
4. Department of Laboratory Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.