1. Department of Environmental Health Sciences, Graduate School of Public Health Seoul National University Seoul Korea
2. Department of Environmental Health Korea National Open University Seoul Korea
3. Department of Pediatrics Chonnam National University Hospital, Chonnam National University Medical School Gwangju Korea
4. Total Health Care Center Kangbuk Samsung Hospital School of Medicine Sungkyungkwan University Seoul Korea
5. Department of Pediatrics, Childhood Asthma Atopy Center Environmental Health Center Asan Medical Center University of Ulsan College of Medicine Seoul Korea
6. Department of Pulmonary and Critical Care Medicine, Asan Medical Center University of Ulsan College of Medicine Seoul Korea