1. Department of Health Administration and Management; College of Medical Science; Soonchunhyang University; Asan Korea
2. Department of Pediatrics; Samsung Medical Center; Environmental Health Center for Atopic Diseases; Sungkyunkwan University School of Medicine; Seoul Korea
3. Department of Preventive Medicine; Dankook University College of Medicine; Cheonan Korea
4. Department of Occupational and Environmental Medicine; College of Medicine; Dankook University; Cheonan Korea
5. Department of Social Medicine; Dankook University College of Medicine; Cheonan Korea