1. Department of Pathology, Gachon University Gil Medical Center, Incheon, Korea.
2. Department of Pathology, Sacred Heart Hospital, Hallym University School of Medicine, Anyang, Korea.
3. Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
4. Department of Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.