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Concentration-response curve (solid line) for daily average concentrations of airborne fine particulate matter with three degrees of freedom and the log-transformed relative risk of outpatient visits for psoriasis between January 1, 2010 and December 31, 2017 in Beijing, China. The relative risk is adjusted for temperature, relative humidity, public holiday, and day of the week. Dotted lines represent the 95% confidence intervals.
