1. Department of Pediatrics, CHA University School of Medicine, Seongnam, Korea.
2. Department of Pediatrics, CHA Gangnam Medical Center, CHA University School of Medicine, Seoul, Korea.
3. Department of Pediatrics, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea.
5. Department of Biomedical Science, CHA University School of Medicine, Seongnam, Korea.
6. Division of Respiratory Viruses Center for Infectious Diseases, National Institutes of Health, Korea Centers for Disease Control and Prevention, Cheongju, Korea.