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Haggerty, Catherine L.; Ness, Roberta B.; Kelsey, Sheryl; Waterer, Grant W. (2003). "The impact of estrogen and progesterone on asthma". Annals of Allergy, Asthma & Immunology. 90 (3): 284–91, quiz 291–3, 347. doi:10.1016/S1081-1206(10)61794-2. PMID12669890.