1. Division of Infectious Diseases, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
2. Vaccine Bio Research Institute, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
3. Department of Biostatistics, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
4. Department of Pediatrics, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea