1. Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
2. Environmental Health Center for Atopic Diseases, Samsung Medical Center, Seoul, Korea.
3. Department of Pediatrics, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea.
4. Department of Pediatrics, Kosin University Gospel Hospital, Kosin University College of Medicine, Busan, Korea.
5. Department of Pediatrics, Chungnam National University Sejong Hospital, Sejong, Korea.
6. Department of Pediatrics, Hallym University Hangang Sacred Heart Hospital, Seoul, Korea.
7. School of Arts and Sciences, University of Richmond, Richmond, VA, USA.