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It is a mixture of smoke particles, chemicals, and oily residue that settles on surfaces

To ensure nationally representative and comparable estimates (prevalence, proportions, and means) across 5 surveys, we used standardization method based on the 2010 China census population to account for changes over time in age structure, population migration, and nonresponses [19]

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The patients bloodwork revealed a CBC with no eosinophilia, and his tests for C-reactive protein, antinuclear antibodies, rheumatoid factor, and antineutrophil cytoplasmic antibodies were all negative, as were tests for hepatitis B and C, and HIV