1Department of Environmental Medicine, NYU School of Medicine, 57 Old Forge Road, Tuxedo, NY 10987, USA
2Center of Environmental Medicine, Graduate Institute of Medicine, Kaohsiung Medical University, 100 Shih-Chuan 1st Rd, San Ming District, Kaohsiung 807, Taiwan
3Division of Environmental Health and Occupational Medicine, National Health Research Institutes, 35 Keyan Rd, Zhunan, Miaoli County 350, Taiwan
4Johns Hopkins Asthma and Allergy Center, Johns Hopkins University School of Medicine, Baltimore, MD 21224, USA