Outdoor aeroallergen impacts on asthma exacerbation among sensitized and nonsensitized Philadelphia children oleh Anneclaire J. De Roos, MPH, PhD, James P. Senter, MD, Leah H. Schinasi, MSPH, PhD, Wanyu Huang, MS, PhD, Kari Moore, MS, Mitchell Maltenfort, MS, Christopher Forrest, MD, PhD, Sarah E. Henrickson, MD, PhD, Chén C. Kenyon, MD, MSHP