1. Department of Pediatrics, Pusan National University Yangsan Hospital, Yangsan, Korea.
2. Department of Pediatrics, Childhood Asthma Atopy Center, Humidifier Disinfectant Health Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
3. Department of Pediatrics, College of Medicine, Chung-Ang University, Seoul, Korea.
4. Department of Pediatrics, International St. Mary’s Hospital, Catholic Kwandong University, Incheon, Korea.
5. Department of Pediatrics, Soonchunhyang University Cheonan Hospital, School of Medicine, Soonchunhyang University, Cheonan, Korea.
6. Department of Pediatrics, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.
7. Department of Pediatrics, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Korea.