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Leonardi, Nora A; Spycher, Ben D; Strippoli, Marie-Pierre F; Frey, Urs; Silverman, Michael; Kuehni, Claudia E (2011). Validation of the Asthma Predictive Index and comparison with simpler clinical prediction rules. Journal of allergy and clinical immunology, 127(6), 1466-72.e6. St. Louis, Mo.: Mosby 10.1016/j.jaci.2011.03.001
