1. MRL, Merck & Co., Inc., Rahway, NJ, USA
2. Department of Pediatrics, Pusan National University Children’s Hospital, Yangsan, Republic of Korea
3. Department of Pediatrics, Sungkyunkwan University School of Medicine, Samsung Medical Centre, Seoul, Republic of Korea
4. Department of Pediatrics, Korea University College of Medicine, Seoul, Republic of Korea
5. Department of Pediatrics, Incheon St. Mary’s Hospital, Incheon, Republic of Korea
6. Department of Pediatrics, Chung-Ang University Hospital, Seoul, Republic of Korea
7. Department of Pediatrics, Inha University Hospital, Incheon, Republic of Korea
8. Global Medical Scientific Affairs, MSD Korea, Seoul, Republic of Korea
9. Global Clinical Trial Operations, MSD Korea, Seoul, Republic of Korea