Exposure to indoor allergens in homes of patients with asthma and/or rhinitis in southest Brazil: effect of mattress and pillow covers on mite allergen levels - Tobias, Kátia Regina Coimbra; Ferriani, Virgínia Paes Leme; Chapman, Martin D.; Arruda, Luisa Karla de Paula (International archives of allergy and immunology, 2004)