1. Department of Pediatrics, Eulji General Hospital, Seoul, Republic of Korea.
2. Department of Pediatrics, Eulji University School of Medicine, Daejeon, Republic of Korea.
3. Nowon -Gu Health Care Center, Seoul, Republic of Korea.
4. Division of Respiratory Viruses, Korea National Institute of Health, Centers for Disease Control & Prevention, Chungcheongbuk-do, Republic of Korea.