1. Department of Pediatrics and
2. Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan;
3. Department of Pediatrics, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan;
4. Center of Excellence for Environmental Medicine and
5. Institute of Clinical Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan;
6. Johns Hopkins Asthma and Allergy Center, Johns Hopkins University School of Medicine, Johns Hopkins University, Baltimore, Maryland, USA