1. Department of Pediatrics, Chungnam National University Sejong Hospital, Sejong, Korea.
2. Environmental Health Center for Atopic Diseases, Samsung Medical Center, Seoul, Korea.
3. Department of Pediatrics, Hallym University Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, Korea.
4. Department of Pediatrics, Oz Pediatrics Clinic, Yongin, Korea.
5. Department of Mathematics, Ajou University, Suwon, Korea.
6. Statistics and Data Center, Research Institute for Future Medicine, Samsung Medical Center, Seoul, Korea.
7. Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.