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Marks, Guy B., Ezz, Wafaa, Aust, Nathan, Toelle, Brett G., Xuan, Wei, Belousova, Elena, Cosgrove, Carman, Jalaludin, Bin, Smith, Wayne T.. U.S. Department of Health and Human Services; 2010. Respiratory health effects of exposure to low-NOx unflued gas heaters in the classroom: a double-blind, cluster-randomized, crossover study.