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Environmental allergens and asthma in urban elementary schoolsAmr, Sania; Bollinger, Mary E.; Myers, Monica; Hamilton, Robert G.; Weiss, Sheila R.; Rossman, Maura; Osborne, Lisette; Timmins, Sidey; Kimes, Daniel S.; Levine, Elissa R.; Blaisdell, Carol J. · Annals of Allergy, Asthma & Immunology · 2003