Prevalence, sociodemographic characteristics and spatial distribution of systemic lupus erythematosus in France: a nationwide study using health claims data with insights into hydroxychloroquine prescription patterns.

We decided to restrict our study to prevalence as the estimation of annual incidence of chronic diseases such as SLE, where the delay between the first manifestations of the disease and hospitalisation or attribution of a LTD status may be significant, is associated with large imprecisions in the computed estimates.

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