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Childhood asthma clusters and response to therapy in clinical trials.

C. D. Page, C. Sorkness, R. Gangnon, 2014, The Journal of allergy and clinical immunology.

Urinary Cotinine as a Measure of Passive Smoke Exposure in Asthmatic Children

A. Duggan, C. Ogborn, K. Duggan, 1994, Clinical pediatrics.