1. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
3. Department of Microbiology, Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea.
4. Brain Korea 21 Project for Medical Science, Brain Research Institute and Department of Pharmacology, Yonsei University College of Medicine, Seoul, Korea.