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Complexity of chronic asthma and chronic obstructive pulmonary disease: implications for risk assessment, and disease progression and control PMCID: PMC2752709 Published in final edited form as: Lancet. 2008 September 20; 372(9643): 1088–1099. doi: 10.1016/S0140-6736(08)61450-6. Personal and Ambient Air Pollution is Associated with Increased Exhaled Nitric Oxide in Children with Asthma PMCID: PMC1665398 |